How to switch 88 98 OBS chevy V6 motor mounts for LS conversion THE EASY WAY

We believe that we did this the easiest way. If you are LS swapping your 88-98 Chevy truck and it is an original V8 truck then you're good to go. If you have a V6 truck, you need to switch your stock mounts on your frame out for the V8 mounts that go on that same truck.
Tools you'll need:
24mm socket and wrench. You can make due with crescent wrenches if that is all you have.
15mm deep socket if you remove the top shock bolt.
15mm wrench to stick inside the frame to hold the mount nuts while you loosen the bolt up top with your 15mm of choice.
A floor jack, or two if you have more than one it may be easier.
Jack stands to hold the truck up while the front wheels are off.
Lastly we suggest having a helper. This makes taking the mount hardware off much easier and aligning the control arm back into its spot.
If you'd like to see more on our LS swap build on our 95 Chevy truck, check out the channel and subscribe to keep up as we move forward on the build.

[@garrettterry6883]

Hey all, I just changed the motor mounts on my 91 and I found a way to change them out without messing with your suspension. First off, I had the engine out. Im sure it’s a lot harder to do with the engine still in lol. Anyway, you take a 10” extension, a 3” extension, a universal, the socket, and a ratchet, all 3/8” drive. You can fit all that up through the frame between the frame and lower control arm bushing. It does take a little maneuvering but once you get it on the backing nut, loosen the mounting bolts and bam. I changed mine in 15 minutes a piece. Hope this helps out!

[@MattyXBuilds]

Never thought of the sniper route, for sure would be easier this way! Good pointer

[@tomreyes4908]

I’ve got my engine out now and really don’t want to take the suspension apart. I’m going to try your method. Thanks.

[@tomreyes4908]

Gary, he’ll yeh that works with those 3/8” extensions. The top one was a little tricky but they all came out easy enough Thanks for that info No way I was gonna take my front end out to change them.

[@jordilara1050]

even after 3 years ur solution was the only one that helped me, thank you sir. you saved me a ton of time lol

[@MattyXBuilds]

@jordilara1050 I’m glad to hear that! We did our best to help the community out that was just trying to get the swap done!

[@jamesclev9]

Recommended tools, 15mm wrench, 15mm socket, 23 mm socket, crescent wrench, LOTS of cussing.

[@MattyXBuilds]

23? Lol

[@jamesclev9]

@@MattyXBuilds lower control arm bolts?

[@charleshenson4183]

Why not just grind the heads off of the bolts & just knock what's left threw the frame & leave the suspension as is?

[@banga8080]

Bro you have the most detailed vid of all the little querks and duhickies you need to get thru an LS swap nobody says half of what you've said in 2 vids 👍🏾👍🏾👍🏾👍🏾👍🏾👍🏾👍🏾

[@MattyXBuilds]

Thank you bro! We noticed when researching this seemed like it was gonna be straightforward and easy and we’ve ran into a few things that no one talks about that we have had to find out the hard way. Glad it’s useful info that’s the goal!

[@Brandon_obs_ls]

@@MattyXBuilds do you have to notch the frame? For the factory truck ac to fit

[@MattyXBuilds]

Yes! You either notch the passenger side of the frame for the factory truck location compressor. I wasn’t comfortable with that so I planned on doing the high mount kit

[@Brandon_obs_ls]

@@MattyXBuilds ohh thx for the information ima cut it lol wish me luck 💯😂 it’s cause I wanna use all oem parts for the 5.3

[@MattyXBuilds]

You got it bro just be sure to weld a pocket back in the frame

[@joshrodriguez5166]

What Was The Part Number At Autozone For The Mounts ?

[@darrellhughes6773]

I hve a 97 Chevrolet Cheyenne pickup came wit v6. Wats d part numbers for dem v8 mounts please.

[@MattyXBuilds]

Don’t remember the part numbers but just got in the parts store and say you got a 97 c1500 with the 5.7 v8 and say you need the motor mounts and they’ll get you right

[@darrellhughes6773]

@@MattyXBuilds Thanks a million

[@wolfgangdavis3093]

Bro this video is a lifesaver! Thank you!

[@CoolCarsKJ]

I did this shit, last year. An absolute pain in the ass but i got it with the right tools. I went ahead and put Energy Suspension Polyurethane bushings in too.

[@MattyXBuilds]

It was an ultra pain. Energy suspension makes solid stuff, great choice! We’re doin a drop kit that comes with control arms so we just slapped ours back together for the time being.

[@jimmypage3183]

Try this. Lift the truck at the frame only. That will leave juuuust enough room between the A-arm and the frame to get a swivel in there. I did this yesterday.

[@corvettespecialist9635]

This video made my life a lot easier. Did v6 to LS swap

[@LidZLife]

Great info! I'm working on a 1989 OBS LS Swap now. Thanks for the video.

[@MattyXBuilds]

No problem! We spent a long time figuring out what mount to use so we figured some people could use some help

[@ArColt]

Omg bro I been looking back and forth on the web and not one damn video I’ve seen that the 5.7 engine mount would work, now I’m over taking my motor out twice cause it’s not aligning right with the aftermarket mounts, smh but thank you for letting me know, 5.7 v8 engine mounts to ls engine. I’m having a fitment issue with the aftermarket headers I bought

[@flacodeoroable]

precisamente yo estoy haciendo un trabajo igual y la verdad no desarme nada de eso, por el lado de enfrente del control arm meti un ratchet de 3/8 flexible con un dado de 15 mm y por el lado de afuera con una llave 15 mm. levante el motor con un forklift y pude cambiarlos sin quitar los lower control arms. las brakets las cambie porque estaban rotas y aproveche parea cambiar los soportes del motor

[@rickymortero3023]

Obs gang

[@rickymortero3023]

Just got a new sub 👍

[@angelc8271]

Oh man, I can't thank you enough! I was thinking of doing the same thing of lowering the arm, but I just needed to have that reassurance. Liked and sub! Keep it up!

[@MattyXBuilds]

It’s tricky but it can be done! Thanks for the support homie, we got more content comin!

[@zanedrummond8958]

For future reference, show the hard parts. Some of us have no choice but to do it alone and are now looking at that dangly mess pretty fucking salty. 😅

[@saulm5100]

Will this work on a 4WD K1500?

[@MattyXBuilds]

I wanna say the K trucks had pedestal “floating” motor mounts so you might not have to do this

[@chicagomike6666]

Really good video--I'm changing out motor mounts on a 6.5 TD that I've been restoring. It uses very similar clamshells and your tips are right on...the issues are the same--just a lot heavier engine...lol. I have access to a lift and its prepped--the scary part comes when we hoist the engine...Thanks!

[@funguy7979]

Appreciate the help on the mounts

[@rogervillela8241]

I would of just torch them out and plug weld back inn.

[@weslywho7508]

Hey man, can you send me a link to those dirty dingos? I can’t find anything for the 4.3 v6 to the 5.7 v8

[@weslywho7508]

But everything else was very helpful

[@robertash883]

drill a 15mm in the front of the crossmember and nothing has to come apart.

[@josevelasco7456]

If my obs is 4x4 does that factor anything when putting the 350 motor mounts & dirty dingo kit

[@MattyXBuilds]

I’m not 100% sure you might check the forums. I think you’d be fine, might just depend on where all your front diff stuff is, might need a different oil pan or headers, not too sure.

[@Lilp00persc00p]

That lower a arm is a b!@#$

[@franciskovaldovinos2409]

Appreciate the info bro

[@mblrwon]

Do you have the link

[@georgerodriguez2391]

What are the part number on the mounts

[@hug00l]

Did y'all have any luck fitting with the stock AC? I haven't seen anybody do it

[@MattyXBuilds]

Have to notch the frame, a few people have done it

[@thomasblais7751]

Yo Matt old vid I know but I have a 5.0 v8 obs are they the same mount as the 5.7?

[@MattyXBuilds]

Not 100% sure but I believe the v8 mounts are the same whether it’s 5.0 or 5.7. I wanna say only difference is bores so external engine should be the same

[@juancaballero284]

Do you have to notch the frame to fit the ac compressor?

[@MattyXBuilds]

If you want to low mount, yes

[@manuelmeza9381]

I did the same on mine, and yes, it's not easy but definitely it can be done, and it really helps if you have the right tools.

[@justinvaughn801]

One way to do it a bit safer.. use coil spring compressor tool.. then lca bolts. No need to disconnect any ball joints, spindle etc 👍🏾

[@MattyXBuilds]

Great idea! That would be better, we just didn’t have access to the tool at the time. 👍

[@b.c4066]

No need to do any of that, just use a 1-1/4" hole saw in the front of the cross member, then use a box end wrench to put each nut in place. Old trick from Camaros, cutlass, Malibu's, s-10, to various 2wd trucks. Don't have to touch the suspension at all.

[@justinvaughn801]

@@b.c4066 not a bad idea..

[@fatallykinky8886]

@@b.c4066 I like the way you think magic man🤙that'll be my last opinion but it'll definitely be easier to bolt back up

[@funguy7979]

I might be able to get my hands on a local 383. What mounts would I need to put into a 97 sierra that originally had a V6? Can I take the front assembly and reuse it like I could with the vortec 350?

[@jameegardnerracing2385]

Thanks for showing how you removed those mounts, really helped me out on my build which I'm in the middle of right now.

[@MattyXBuilds]

You bet man!!! I’m glad cause I know we were bangin our heads

[@vdub4201]

yeah.. just did that on my 89 c2500.. make sure there are no burrs, or rough edges on the a arm bushings, or on the frame around the bolt holes.. or no matter what you do.. they wont go back.. had a few on the bolt holes that i tried file down, nope.. then used a saw zaw to get the burr down .. was just enough of edge from removing the a arm bolts that the bushing would not fit..

[@kirkkidwell2984]

OKC here, I thought you was in Oklahoma, then when you talked a out the fire, I knew you was an Okie! Love it!

[@kyore789]

Coolcarskj actually covered this. He did a video on how he did his V6 to LS swap glad it’s getting out there more though kzbin.info/www/bejne/a6CbiX5_jsabg7M 2 minutes in he explains it but the whole video is extremely useful info

[@MattyXBuilds]

That’s my boy! I keep up with him on IG

[@carlson6022]

I did it by myself without dropping the lower control arm and it was an absolute pain in the butt.

[@tylercaudillo969]

Hey! I live in Choctaw and am doing a swap! You should come check it out. It will be more of a strip truck vs street. You’d love it.

[@MattyXBuilds]

That would be cool do you have Snapchat or Instagram?

[@slaskey]

Have you started your swap

[@slaskey]

Tyler Have you started yours

[@cheatingiscompeting3647]

Hey I'm here for some information if anyone could help. This video was very helpful while trying to learn how to get those mounts in. I have a couple questions. I would be trying to put a 70s 350 in this model of truck is it basically the same situation with those mounts as an LS engine just different engine mounts? Another question is would there be clearance for the oil pan or would a different oil pan be needed due to v6 and v8. I would assume not since 4.3 and 5.7 are the same engine minus a couple cylinders. Also would it be easier to use a TH350 transmission or would the manual 5 speed. I'm not a complete rookie but I'm definitely not a master mechanic either.

[@se9252]

I did it by myself with a screw driver and a 15mm hose clamped to it.

[@daurrell23]

Do you still have the old v6 mounts can I buy them

[@MattyXBuilds]

I do not

[@funguy7979]

Would those mounts work with a 8.1 vortec?

[@meanodeano9407]

Easiest way is to use fishing string to pull bolt up with lock washers

[@dawsoncopeland1423]

Thank god this video is here bc im replacing the 4.3tbi to a 350tbi in my 88 and I knew this part was the bigest bitch

[@MattyXBuilds]

So stoked the video could be helpful!! It’s a terd for sure to deal with

[@FaDeDStudios]

Are you planning on cleaning the frame while you have space?

[@cesarrubio3634]

Since there’re solid mounts, is there a high frequency and vibration?

[@MattyXBuilds]

The V6 mounts use a bushing style mount that bolts onto the block. The V8 style mounts have bushings on the frame side of the mount. They aren’t solid if they’re OEM style

[@WiserAsIGrow]

when you moved the engine forward, did that mean you had to make a new trans crossmember & driveline?

[@MattyXBuilds]

No in another video I showed y’all how I moved the crossmember and drilled new holes

[@WiserAsIGrow]

so if you did move the crossmember, you had to use a longer driveline? I'm converting my 97 4.6/5mt 1500 to a cammed 5.3 /5mt@@MattyXBuilds

[@MattyXBuilds]

Well what I would do is get the Dirty dingo engine mounts and they let you slide the engine 2” forward or aft. I would leave your 5mt and driveline in stock location and then try to drop the engine in and see if you can make it happen without moving the trans

[@WiserAsIGrow]

thats mainly why I was asking what you did I kind of figured.. I'm going to go with dirty dingo style mounts but with solid frame mounts I appreciate the reply thank you! @@MattyXBuilds

[@MattyXBuilds]

No problem, you got this 🤘

[@biggrob33]

Thanks

[@rbailey225]

If you're not reusing these mounts, couldn't you just get after the bolt heads with a torch, grinder or cutoff wheel?

[@MattyXBuilds]

Gotta save the hardware to bolt the replacement in with. unless you wanna weld the mounts on but I don't think thats a great idea either unless it's solid mounts for like a race setup.

[@rbailey225]

@@MattyXBuilds Gotcha. Is it special hardware or can you just grab some new grade 8 at Fastenall?

[@MattyXBuilds]

I’m sure grad 8 replacements would be just fine

[@robertkeys7834]

Keeping the a/c did you have to change the shaft length?

[@MattyXBuilds]

The setup currently doesn’t have AC

[@rmontoto2435]

What about the drive shaft ?does the original one fit if the motor is moved forward??

[@MattyXBuilds]

I had to slide my engine back but yes stock shaft worked

[@corvettespecialist9635]

Did you use your stock transmission? I have a v6 doing a 4.8 LS and I’m having my stock 4L60e rebuilt and was going to install my LS with the ict billet mounts which are supposed to put the LS in the stock location as the 5.7 did you use your stock trans and adjust your engine further back?

[@MattyXBuilds]

Naw I used a ‘99 4L60e

[@KevinB1]

We're you actually able to use the stock LS a/c compressor with those mounts? Without notching the frame?

[@MattyXBuilds]

Nope, I would need to notch the frame to low mount the AC compressor in stock truck LS location

[@KevinB1]

@@MattyXBuilds Thanks.

[@dean1627]

Wait I thought you said it would clear?I have a stock 5.3 with ac pump at the bottom was gonna buy the same mounts you put on the frame and engine and what your saying is the ac still won’t clear is that right?

[@KevinB1]

@@dean1627 Not without notching the frame. I used an R4 compressor with a top inside mount and fabricating a log manifold so it will clear the R4. Mount I'm using is an ebay piece, Nice NC R4 upper mount. Standard logs will NOT clear it as well.

[@Tm_90723]

Where do I get the 6.0. Brackets ?

[@MattyXBuilds]

6.0 LS? All LS swap brackets will work, eBay, dirty dingo, whatever brand you wanna go with. You just have to have V8 OBS mounts on your frame.

[@ismaelalvarez7253]

are you going to have a costume drive shaft if you pull the engine to the front?

[@MattyXBuilds]

No. The transmission mounted in the same holes for its crossmember so the driveshaft will be the same

[@ismaelalvarez7253]

@@MattyXBuilds thank you for the info

[@droramirez1339]

What’s the parts u got from auto zone called?

[@MattyXBuilds]

Motor mounts for 95 Chevy c1500 with the 5.7l motor. It has to be those mounts

[@makakilodrive9739]

@@MattyXBuilds Awesome vid. Would you have the Autozone part number?

[@MattyXBuilds]

I don’t remember that one

[@slaskey]

Did you guys finish the swap

[@MattyXBuilds]

Yep

[@slaskey]

@@MattyXBuilds I'm getting ready to start one as soon as I get my block back kind of excited I'm also in Midwest City. Which transmission did you use

[@MattyXBuilds]

@@slaskey 4l60e out of a 99. Hardened shell, corvette shift servo, nicer clutches, 2500 stall billet triple disk converter

[@slaskey]

Did you have to do mods to the drive shaft for it to fit

[@MattyXBuilds]

Nope, but I did slide the engine/Tranny backward on the dirty dingo mounts to get it right.

[@laobs6390]

Hey man what size are those bolts for motor mount to the frame? @MattyXBuilds

[@MattyXBuilds]

I wanna say 15mm for the socket

[@laobs6390]

@@MattyXBuilds I been trying to get some bolts because the original ones I grind them to remove motor mounts lol

[@MattyXBuilds]

Maybe 10x1.5 but I’m not 100% sure

[@laobs6390]

@@MattyXBuilds ok man I will check thanks

[@ThaJRC]

What are the length of those bolts?

[@laobs6390]

Hey man how you do it for the transmission mount? @MattyXbuild

[@MattyXBuilds]

Don’t have to change it for a 4L60

[@laobs6390]

@@MattyXBuilds so it will fit on a 4L60

[@MattyXBuilds]

Yep

[@marcelinoramos8526]

Any recommendation on a 4L80e transmission

[@MattyXBuilds]

Like mounts or the trans itself

[@blazinlow8153]

I just cut the old ones off with a grinder and was able to tighten 2 bolts on each v8 mount without removing control arms and then put a few weld on them lol

[@joenutsgarage]

Awesome content man!!! Currently doing an ls on mine and this video will help me a lot thanks! Also please check out my channel for my build!