T-98 Adapter Arrived

Adapter #910467 arrived. Now all I need is to figure out a bearing retainer/throw out bearing guide. I made it to the swap meet in Puyallup. Talked to a lot of people including Herm. The way he is adapting his T98 requires his adapter and custom built T90 retainer with a rubber sear doing away with the felt. Thus, it would require finishing a surface on my input shaft to accept the rubber seal. However, we never did get to cost?

I spent the good part of today measuring and remeasuring the front of the T18 to F-134 I am dealing with. If someone has one and is willing to share the measurements on the T98 retainer. I have an idea that just might work if I had the measurements to work to.

Since Kovak nor Advance Adapters offers anything for this. I can't help but feel the is someone out there that has already come up with a workable design. I have spent a ton of hours researching with no good results. I hate to have to reinvent what may have already have been done.

Major Jack

 

Although I've heard talk, I expect it is rather unlikely that anyone to date has ever mated a Borg Warner T18 onto the Willys 134 engine.
It's much much easier to use the original T98 to Willys system whenever the proper transmission can be sourced.
The T18 maindrive gear (input shaft) into a Willys bellhousing would be most problematic.
I believe both the Ford and the ultra short Jeep maindrive gears will be much too short to use.
The Ford maindrive gear is 6-1/2" stickout.
The short Jeep maindrive gear is 7-1/8" stickout.

So just what specific maindrive gear are you trying to fit into the Willys 134 bellhousing ?

 

I have a T18-1B - 15/16" - 10 spline - shaft length from face of case 6 3/16" - output shaft and adapter to small hole D18. This T18 case is identical to T98.

According to Herm, The T98 - F-134 bearing retainer is a bolt on application. If you can find one!

The #910467 is the correct adapter to this transmission.

I have been told that with the correct retainer, my input shaft will work. If that proves to be wrong. I have access to a shaft that can be machined.

Have been trying to locate a f-head with a bellhousing and crank that I could shove my trans in to get an idea of fit.

Any advise is appreciated.

 

$120

 

Well that particular maindrive gear is way too short to work with a Willys 134 bellhousing.
There-in lies the main problem.
The T98 and 18 were commonly used for many industrial applications but no T18 maindrive gears are of the correct length.
That's exactly why no one to my knowledge has mated the T18 to a 134 bellhousing.
You would either need to make a custom bellhousing or else custom maindrive gear.

The correct T98-A maindrive gear has a stickout length of 7-7/8".
Maindrive gear OAL is 10-1/2"
The pilot diameter is standard Willys .625

The clutch release bearing slide tube is 1.25" O.D.
The bearing retainer OAL from transmission face is 4-1/8"
The bearing retainer provides two critical index diameters.
One diameter for the 910467 adapter plate is ? and its 4-1/4" to fit the bellhousing bore

 

Yes he did.
Finest determination, skill, craftsmanship, and hard work I've ever seen.

 

Here is a thought. Open for discussion.

T98 Stick out from face of case: 7 7/8" (I am assuming this is the same for a T90)
Subtract the adapter thickness: 1"
You are left with: 6 7/8"
T18 Stick out from face of case: 6 2/8" Subtract
Still: 5/8" Short
Using the T98 adapter as a pattern, mark and drill the case to the T90 bell housing bolt pattern so housing can be bolted directly to the case.

Have Advance Adapters make a pilot bushing that is 5/8" oversize. I would think this would give plenty of room between the bearing face and the
arms on the pressure plate.

From the pictures on his site. It appears on Herm's adapter he uses pins threaded into the adapter with nuts on inside of the bell housing.

This would also gain a bit of drive shaft length and move levers more to the stock position.

Hope this makes since.

Other option - machine a longer T18 input shaft to 7 7/8" length?

 

You can be right. I have seen both quoted. I have not measured but will get out the calipers. I am not an aluminum welder and do not have the ability to build a custom housing. Wish I could.

 

Mine is an SM420. It was a fun project and it works great, but it was a lot of work. As you know, the problem with these swaps with the Fhead is the stock bell housing is already pretty deep and once you use an adapter plate for the transmission you end up with not enough input shaft length to reach the pilot bushing. One other idea I kicked around was making a custom pilot bushing that would stick out further than the stock one. Couple this with taking some material off the stock bellhousing face and the adapter plate and I think it could be made to work. Still probably more work that it's worth unless the journey sounds entertaining.

 

No the T90 does not use a 7/8" thick bellhousing adapter plate.

If by chance you bolt the transmission direct to the bellhousing then the 6-1/4" stickout maindrive gear would still be roughly 3/4" short.
A 3/4" pilot bushing shoulder is way to much bushing stickout.
That much pilot bushing shoulder will interfere with the clutch disk.

Machining a larger maindrive gear down to the desired size is a gamble and dependent upon on what you start with.
Now you can see why the T98-A is highly sought after.

 

Without challenges in life. where would we be? What is making it difficult is not having a block with crank and bell housing to work from makes this a real challenge.

I had forgotten about the clutch. Thanks for that.

A member of this forum has a longer T18 shaft and is sending it to me. Gonna see if it can be cut down and re-splined.

Retainer still has to be addressed.

 

Not exactly sure how much shoulder stickout you could put on a custom pilot bushing.
Perhaps if the pilot stickout was made at max possible stickout you could get the 6-1/4" maindrive gear inside it far enough to work.
I think 1/2" of maindrive gear going into the pilot bushing will suffice.
Also the stock hub on the clutch driven disk could be ground a little shorter than standard to allow for extra pilot bushing clearance.

I have an old L-134 setting outside.
Maybe I could pull the bellhousing off to determine max possible pilot bearing stickout .

What kind of clutch are you planning on ? 8-1/2" or 9-1/4" ?

 

The pilot bushing race is 15/16" long by .59 diameter.

Clutch disc will be whatever is stock to 1954 CJ3B

 

I'd have to go back and re read the whole thread (too tired right now) but the input shaft length sounds suspicially like an early Scout 4 cylinder T-98. They had the Jeep case bolt pattern but used a shorter and smaller diameter input shaft (main drive gear) and used the 18 transfer case in the Scout 80.

 

Had a Dana 20 large hole. Traded adapters with another member for a small hole D18. Now I can use my D18 with overdrive.

 

I had a chance to compare an original standard 8-1/2" Borg Beck driven disk to an original Heavy Duty 9-1/4" Borg Beck driven disk.
The hub on the 8-1/2" disk sets 1/8" foreward of the disk facing.
The hub on the 9-1/4" disk sets flush with the disk facing.
The 8-1/2" hub cannot be shortened any less concerning it's foreward stickout
It would do no good to make the hub any shorter than it's zero foreward stickout.

This implies that the Heavy duty 9-1/4" driven disk would be the best choice.
It means that the pilot bushing theoretically could stickout 1/8" further to the rear than the smaller clutch will allow.
The 9-1/4" clutch is certainly the best choice for Willys 134 engines having a low geared truck type transmission regardless of any other concerns.

Looks to me that a full 1/4" could be milled off the front face of the Willys 134 bellhousing.

Perhaps later I can get to the flywheel to determine maximum pilot rearward stickout.
I don't estimate maximum allowable rear pilot stickout will be enough to engage the maindrive gear.

Truth is I rather doubt that the short Scout maindrive can be made to work.
You will certainly have to eliminate the 7/8" thick bellhousing adapter plate to make it work.