Willys Overdrive Installation

In this video I am going to install an overdrive unit onto the transmission and transfer case that I have already rebuilt.

[@davehollingsworth3007]

A lot of patience! Been doing these for 40+ years and it's always helpful to watch someone with a little nice twist on a better way of assembly! Bravo! Thank You!

[@metalshaperJeep]

Glad it helped!

[@F.Krueger-cs4vk]

Great demo video, thankyou. I'm seriously thinking of purchasing an over drive unit for my 1944 GPW ford jeep. Finished rebuilding the gearbox. Regards from Australia.

[@jondenney2428]

Great video. I just bought one of Herman’s rebuilt Saturn overdrives. It’s going on my T90 next week. Thanks for the helpful video.

[@geoben427]

Hi Brian, nice job with the transmission and overdrive. Glad to hear you're happy with Herm. I've been looking at his overdrives for a while. Looking forward to the front and rear axles. You've been covering everything I plan on doing! I really appreciate the time you take to produce these videos.

[@metalshaperJeep]

You can feel good about an overdrive from Herm, I have installed many of them and never a problem. Axles are coming next, so keep watching. thanks for being a continued supporter.

[@jorgehedges92]

I have an original Warn OD that I bought from Herm the Overdrive Guy... installed on my 64 CJ3B... worked beautifully since day 1, and has never failed on me. ticks like a Swiss clock when engaged. keep the great videos coming!

[@metalshaperJeep]

Glad the OD is working good for you. Don't worry there are many more videos coming which will cover a variety of topics.

[@garymccord4277]

Great job Thanks for your time is making these videos. II watch to learn on working on my jeep Many Thanks

[@metalshaperJeep]

Thanks for commenting it is great to know that people are learning from my videos. Keep watching many more videos coming. Axles are next to be rebuilt.

[@mil4844]

Nice video again! Keep them coming.

[@metalshaperJeep]

I have both axle housings cleaned and ready for rebuild. Will be showing both the front and rear end build soon.

[@TheOldaz1]

Very informative, thank you.

[@metalshaperJeep]

Thanks for watching!

[@joelhhall]

thanks for posting these

[@metalshaperJeep]

Glad you are watching and taking the time to comment. Check out my other videos and keep watching some new ones.

[@115533662244]

Hi I have installed the same overdrive in a mates ford Jeep only trouble I had was there was no indent ball in the overdrive shift leaver and the spring was all chewed up and as for the shift linkage that’s in the bin it was useless made my own. PS. It was a new unit. The owner is very happy 😃 with the unit

[@212caboose]

invaluable vids! Thank you!

[@metalshaperJeep]

Glad it was helpful!

[@mil4844]

Nice video again!

[@leonardocarrion6183]

Nice work ,please don't forget to show us the assembly of the axes, thanks a lot, and thanks for your time

[@metalshaperJeep]

Axle rebuilds are coming next. Keep watching there is a lot of information coming.

[@jeffgrego2507]

Love the video brian

[@metalshaperJeep]

thanks for watching, glad you enjoyed it.

[@garyrobertson3645]

👍👍👍

[@layneharmon]

Great video, I'm enjoying your channel. I noticed you still haven't mounted the flange bearing for your clutch linkage. How are you going to attach the bearing? I'm going to try to recreate your setup, but missing that detail?

[@metalshaperJeep]

Trying to get the clutch linkage finished but right now the submarine and cj3A project are taking up all my time. Hang in there another linkage video is coming, just not sure when.

[@tx_dingo3034]

Hi Brian, thanks for making these video! Did I miss the video that you show what fluid you recommend to put in these?

[@metalshaperJeep]

I do have lubrication videos out there just search my channel for lubricant. If you need to order any contact me directly at [e-mail] and I can send you a list.

[@markmcdermott8307]

Good demo. Tell me please, why do I not see the ring and pinion being improved from say: 4.88 to 1 like in my 1954 willys station wagon? It has the dana 44 axle in back and a dana 25 in the front. It has a 283 V8 mated to a T90 transmission and a dana 18 transfer case. It would be nice to do modern speeds but not butcher the vehicle. Thanks for your interrest.

[@petechronis2235]

Do you have any information or video concerning installing this O/D on a 1957 FC-150? Especially the linkage connections?

[@MayorFuglycools]

ATV vs Saturn overdrive. . . Hmm not sure which one to get Mayor Fuglycool

[@paulbeaulieu3838]

As always Thank you

[@metalshaperJeep]

Very welcome

[@MrGunPilot]

I put one of these ATV overdrives in my Willys. It won't stay engaged in 1 to 1 under heavy acceleration. Herm said I needed to add shims behind the planetary gear, I'm up to .080 but it still jumps out of gear. It is especially annoying when I'm off roading. I have to use a bungee strap to keep it in gear, which works, but still isn't right. Been trying off and on for years to work out a fix with Herm, but I've practically given up at this point. Nope, not the shift linkage out of adjustment either.

[@metalshaperJeep]

the shims should have worked on your jeep. Do you remember what the stickout was from the transfer case when you installed it? If you have any information I may be able to help you out. I have also in the past changed out the spring and ball that holds the shift rod in the detent. Main thing is don't let it go to long with it popping out of gear, things are wearing in there when that happens.

[@MrGunPilot]

Original stick out was around .670 as I recall. After several exchanges with Herm and subsequent shim additions I'm up to .750 now. Based on the instructions, I thought this excessive, but he said the .677 (or 0.667 depending on which reference in the instructions you use) is only an approximation. I've asked him several times over email/phone, but each time his response is always "...working on a solution, give me a week or so". I do know however that in my case the shift rod will travel an additional 0.110" or so past the ball/spring detent in the rail. I suspected the detent slot to be machined in the wrong spot, or perhaps the shift fork itself may need to be adjusted forward on the rail to force the gears into deeper engagement (if this is even a possibility). I don't know, I'm speculating as I don't know that much about the complete design. I do know I chose a new unit in hopes of avoiding just this type of challenge with a used or rebuilt unit.

[@metalshaperJeep]

99% of the overdrives I have installed worked perfectly with the .677 stickout. I have had to shim only one out of the many I have installed for customers and it was in a CJ2A. I suspect that the problem is in the shift rod, or your fork is excessively worn out. How long have you had the unit installed? Did this problem occur from the moment you installed the unit? Let me know. How is the transmission condition, are you certain the rear bearing and complete mainshaft components are in good shape? I have some ideas but need you to give me some answers to above questions so I can narrow it down. Will wait to hear from you again. Brian

[@MrGunPilot]

None of the components should be worn out, everything was new or rebuild when the brand new ATV unit was installed. The entire package has 1,000 or fewer miles on it currently. It never jumps out of overdrive, only direct. I rigged a hold back mechanism in the floor shortly after it did it the first couple of times. I was on a steep hill climb once when it jumped out of gear and created a tense moment. I'll eventually pull it all back out and take some measurements. If I knew it was going to be so problematic I'd have invested the $1000 elsewhere.

[@MrGunPilot]

No worries Brian, I don't want to bug you with this problem. It's something that should have been corrected when it first arose. I just didn't have time to keep pulling it in and out a couple of years ago to troubleshoot.

[@iratrumble9359]

Could you go over the specialty tools you use i.e your seal puller your grade 8 bolts ECT. Your your axle yoke puller

[@michaelwmccreary]

Good job on the vid! With the stock engine, gearing, tire size, etc., what will be a "comfortable" cruising speed with the overdrive installed?

[@metalshaperJeep]

I like to keep the speed of these old willys around 50 mph. You can certainly go faster but I don't like to keep higher speeds for very long. Remember going is only half the battle, you still have to think about stopping. keep watching and i will show you the brake system I like to use when installing an overdrive.

[@michaelwmccreary]

That makes sense. I bought my CJ2a in need of a total restoration. It runs and I have driven it around the yard but never up to any considerable speed due to the brakes not working. I'm glad you will be covering the brakes in a future vid. Thank you!

[@metalshaperJeep]

Brakes will be covered soon, stay tuned.

[@MikeON22]

I'm installing a used Warn OD now - stickout is .681" instead of expect .677". I'm going ahead with the installation assuming .004" difference won't matter. If it does matter, what can be done about it?

[@Cobra_Ranch_Garage]

Mine is the same. Did yours work ok?

[@PoorSharkie]

Can you explain how this works? does it get rid of a gear on the transfer case or does it now have 4 low, 4 hi, 2 drive, and overdrive? thanks.

[@metalshaperJeep]

the gear is removed from the back of the transmission shaft and replaced with the overdrive unit. It basically reduces your rpm by about 27%. So you can split every gear. For instance first gear, then first gear overdrive, second gear, second gear overdrive. Whatever combination you want, even reverse can be shifted into overdrive. The jeep still has 4 low and high, 2 wheel drive , and neutral. Hope that helps with your question. Brian

[@dgiorgi1725]

Hi, great video !!! Can I just leave the overdrive "IN" all the time? I have a small block 302 and it seems unnecessary to constantly split gears. There is plenty of power in second gear to start with a t98 trans. Will I damage this overdrive doing this? Can I also use reverse with it in overdrive. Sorry for the dumb question and thanks in advance.

[@metalshaperJeep]

yes, you can leave it IN all the time. No problem in forward or reverse.

[@dgiorgi1725]

@@metalshaperJeep Thank you for this reply.😁

[@leslazzell712]

I can't get the main gear to screw on to the main shaft. Help please?

[@metalshaperJeep]

Why doesn't it thread on? Different thread pitch? Wrong diameter? I have never had a problem like this so please let me know what kind of trouble you are having. Brian

[@billmartin4602]

Hey Brian I installed one of Herm’s OD’s it will not stay in direct drive. Herm sent me a .060 shim to install under the nut still pops out of direct drive, overdrive works great. Do you have any suggestions as to what I can do to correct this problem?

[@metalshaperJeep]

I would need to know your measurement from the the back of the gear assembly to the transfer case. Be very accurate when measuring . Brian

[@99snubby]

does the overdrive interfere with the PTO ?

[@metalshaperJeep]

Overdrive gets installed, then an adapter, and finally the pto unit. No problem with a front, rear, or dual, pto and overdrive.

[@rogermontee8264]

Hi Brian I am interested in your gear oil that you use.I have a 3 speed ford top loader adapted to my dana 18 with a warn overdrive. I have a 327 chevy in my jeep.I run my jeep all year round. I live in northeastern Oregon.

[@metalshaperJeep]

contact me directly at [e-mail] and I can send you a list and pricing information. Brian

[@tmwinegar]

What lube do I use for the T90

[@metalshaperJeep]

I have the correct lube for your T-90. You can contact me directly at [e-mail] Let me know if you are operating in extreme hot or cold conditions so I can supply you with the correct viscosity lube.

[@tystordahl6207]

Is it possible to mount a front winch drive chain case on the back of that overdrive? I'd like to have both overdrive and a pto winch

[@metalshaperJeep]

If you watch the video of my CJ6 Jeep you will see me setting some steel with the front winch. On that jeep I have an overdrive, dual shift pto, front winch, and rear wrecker winch. You will need an adapter to put the pto to the overdrive but they are easily available and you should not have any trouble. Brian

[@tystordahl6207]

+metalshaper do you know where I can find an adapter?

[@metalshaperJeep]

you can get one from Herm. Check out his website at hermtheoverdriveguy.com Give him a call and tell him that Brian from KZbin sent you and he will take care of you. Brian

[@bartgoins1782]

That "thread sealer" you put on those bolts, is that like "Red Loctite?"

[@metalshaperJeep]

NO. it is loctite flange sealer. Do not use regualr Loctite!!!

[@bartgoins1782]

I wasn't going to. I normally use Teflon tape, unless some absolutely needs Loctite.

[@collegebaseball1560]

I just installed my overdrive that was working on my rebuilt t-90. The transfer case was fine. However, she won’t spin when in gear. Neutral is fine, but when in any gear, I can’t get the transfer case to spin. It just locks up. I can only turn the clutch disk a few degrees. Thoughts on what could be wrong?

[@metalshaperJeep]

double check to make sure you have the correct unit, 26 or 29 tooth for your application. Not sure what you are working on or where the overdrive came from but there was also a 27 tooth for early vehicles. Just make sure of what you have. Then take it apart and make sure the front blocking ring did not move out of position when you assembled it. If it did the entire unit will be locked up and if you run it like that it will be severely damaged. Take it apart and start again.

[@MicroageHD]

This guy kinda sounds a bit like the Joker :D

[@southeastwillysjeepgettoge2607]

Hey MetalShaper - If you're interested in more Willys Jeeps help & info - check out www.SoutheastWillysJeepGetTogether.com on October 5 in Asheville, NC ... Lots of buyers, sellers, exhibitors, lunch speaker, tech session - and swap meet ... Just a suggestion-hope to see ya ... Optimistically, Will(ys) Springer

[@user-xt2jx1fr1z]

amint latom a csavar grade 5 not grade 8 az nem baj???