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T98a Transmission
Topic Started: Sep 27 2009, 11:39 AM (1,857 Views)
ParadigmCrime
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How often do these pop up for sale, and whats a 'fair' price. I saw one on ebay for 750.

How much work is needed to fit it to a Cj3b?

Are they expensive to rebuild?

Ideally, Im looking for one that needs a rebuild (to get it cheaper, and for the experience of rebuilding it myself).

Plus this way my 3b isnt down while I do the rebuild on the tranny. After I swap them out, I can rebuild my T90 and then sell it to hopefully recover some of the cost.

I already have a lead on some warn overdrives ranging from 40-80 bucks in fort collins CO.
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Daryl
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Lots of differances in the t-98s. Gotta know specifically what you need- bellhousing,case bolt pattern, input shaft length, t/c adapter. Warn overdrives go for several hundred, are you talking locking hubs? Don't count on recovering any money for a t-90 as they are pretty much givaways, worth almost as much for scrap metal right now. Best to buy from someone you trust. Some of the hardparts are no longer available on t-98s , so be really careful trying to buy one needing to be rebuilt as you may end up several hundred into one and having nothing useable but the case. Be patient.
Lotsa Jeeps, and a few extra parts
In Bonney Lake, Washington
Always willing to look at a Jeep for you BEFORE you buy it to check it out.
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oldtime
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For the avid searcher a couple T98-A transmissions become available per year.
Like Daryl says you don't want the M-715 version.
Find a T98-A version with 15/16" -10 spline maindrive gear.
These were installed into models CJ-5,6.

You might outta search for this topic:
Extra Set Of Frame Holes,

I have a little bit of Borg Warner T98 NOS for sale like the large brass sychro rings.

There are several other related components that were used with model CJ-5,6 ... T98-A optional transmission package.

I can detail that info later if need be.
Currently building my final F-134 powered 3B .
Rock Crawler using factory parts from the Willys Motors era (1953-1963)

http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new
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Don
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NOVAK has some information here as to the different types of T-98's.

http://www.novak-adapt.com/knowledge/t98.htm
Don Norris
Southeast, NC

1953 CJ3B
1959 Jeep Pickup
195? M100 trailer
~~~~~~~~~~~~~~
The trail never ends
~~~~~~~~~~~~~~~
If lovin' Jeeps is wrong,
I don't wanta be right.
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Daryl
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I just put a Ford t-98 into my 71 and had to use a plate adapter from the Tranny to the t-14 adapter that came on the Jeep. It has a 1 1/8 10 spline input, thats 10 1/2 inch long ( thanks Ken for remembering the input shaft diameter) Its a Franken Tranny but it is so nice to have the low 1st and reverse with the stock 3.73s
Lotsa Jeeps, and a few extra parts
In Bonney Lake, Washington
Always willing to look at a Jeep for you BEFORE you buy it to check it out.
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oldtime
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I generally consider Novak as a reliable reference so I quickly glanced over the specifications posted there.
I will have to check but I thought that the M-715 uses a 1-3/16" diameter 10 spline maindrive gear in its version of the T98.
Can anyone else verify the M-715 maindrive diameter ?

Also.... while its not exactly the same thing the Ford T18 transmission uses a 1-1/16" diameter 10 spline maindrive gear.
The Jeep T18's (with many input lengths) all used 1-1/8" diameter 10 spline maindrives.
If not mated to the F-134 I would recommend a modified (machined ) version of the Jeep T18.

Here's one thing an F-head 3B owner might consider.
The standard T90 weighs in at only 60 lbs while the monstrous T98 weighs in at 160 lbs.
And realize too that the T98 reverse gear is painfully slow.

My personal bottom line recommendation for those who want a truck 4 speed is:
Jeep T98-A for L+F 134 installations. (15/16")
Jeep (not Ford or Scout) T18 when mated to other common engine transplants. (1-1/8")
Currently building my final F-134 powered 3B .
Rock Crawler using factory parts from the Willys Motors era (1953-1963)

http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new
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jyotin
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Converting a t-98a in a cj5 that was made to accomodate a t-98a as an option is a bigger chore than one might think.

Now, to do the same thing in a cj3b vehicle that was never meant to have a t-98a in it could be a real treat. That rear drive shaft would be very short.

If you decide to do this try to get a skid plate with it as well. The t-98a skid plate is unique, and if you have to convert a 3 speed plate to a 4 speed plate it is a pain. Clutch control tube and rods are unique.

If I was doing it I'd try to get a single lever transfer case instead of the two lever. I believe that you can modify the linkage on the single lever enough to keep it in the floor area whereas the dual lever t/c levers will be pretty far aft.

I wouldn't try to convert a non 4 cylinder t-98a into a 4 cylinder t-98a. The main drive gear is impossible to find and the bearing retainer is only slightly less impossible to find.

However, if you can find a 4 cylinder FC150 t-98a you can easily find the top loading hardware and end up with what you want. I have several t-98a top loading shift assemblies kicking around the shop.

The International Scout 4 cylinder 4 speed application does not have the 6.32 gear ratio --- it is around 4.0. Additionally the Main Drive Gear in the Scout is not as long as it needs to be for a jeep application.
It's just my luck that something good is going to happen to me today.
54 - 3B - down on the farm
67 - cj6 - former state of Alabama vehicle
?? - cj5 T98a - made from spare parts - Ford tractor blue
?? - cj5 T98a - made from spare parts - Jeep green
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jyotin
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Old time

The M715 main drive gear is the larger shaft diameter, and is the same as the main drive gear in the six cylinder fc150 application.

I have a spare t-98a main drive gear from a 4 cylinder engine in my shop and I have long wondered if I could get the larger MDG's from a 6 cylinder machined down using the 4 cylinder MDG as a pattern.

I also thought that if someone could machine the larger main drive gear down that it would be more interesting to have a t-18 main drive gear machined down to the 4 cylinder size.

The shafts are just about identical at the gear end, with the only differences being the shaft length, diameter and spline.

Advance adapters offers a t-18 MDG to go into a t-98 for the six cylinder application. The only difference is the roller bearings inside the MDG-to-main shaft diameter and count. Note that the t-18 MDG can be used in a t-98a using this bearing trick, but a t-98a cannot be used in a t-18.


However, if one could start with a t-18 MDG and get it machined to a 4 cylinder size it'd be really cool to have the only 4 cylinder t-18 in existence.

j
It's just my luck that something good is going to happen to me today.
54 - 3B - down on the farm
67 - cj6 - former state of Alabama vehicle
?? - cj5 T98a - made from spare parts - Ford tractor blue
?? - cj5 T98a - made from spare parts - Jeep green
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oldtime
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jyotin,
6 cylinder FC was the 170.
But otherwise... I believe your right its the same 1-1/8" diameter ten spline MDG for the 226 Hurricane or the 230 Tornado.
Some idiot must have told me its 1-3/16" and I foolishly remembered that oddball size.

Quote:
 
I have a spare t-98a main drive gear from a 4 cylinder engine in my shop and I have long wondered if I could get the larger MDG's from a 6 cylinder machined down using the 4 cylinder MDG as a pattern.

Yeah a good machinist could surely turn down the MDG diameter and respline it.
But the bearing retainer might be problematic ?
I believe the bearing retainer I.D. must remain compatable with the MDG diameter.

Quote:
 
I also thought that if someone could machine the larger main drive gear down that it would be more interesting to have a t-18 main drive gear machined down to the 4 cylinder size.

Yeah the T18 is probably a slightly better transmission. At least parts wise.

Quote:
 
Note that the t-18 MDG can be used in a t-98a using this bearing trick, but a t-98a cannot be used in a t-18.

Very interesting ! So if buying a tansmission without correct MDG the T98 might be the better deal. Hmmm ?
Currently building my final F-134 powered 3B .
Rock Crawler using factory parts from the Willys Motors era (1953-1963)

http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new
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