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What Transmission Recommended

C

Corny67

New Member
Joined
Dec 29, 2022
Was on Herms site looking at transmissions. Am wanting to put a four speed in the Cj2. Am leaning towards the T18 for a flat head. Anybody have any input on which transmission would be better than others? Considered the T98 but only small parts are available for it. Same for the 420.
 
I'ld lean towards the 3.15 transfercase gears from advance adapters. The 4 speeds are built for 4x the motor you have and take a bit of power to turn.
 
If you keep the L134 engine, how had you planned to adapt the L134 to a T-18? AFAIK there is no aftermarket support for that. A professional machinist could design and make the parts you'd need, but most owners don't have the skill or tooling needed.

The F134 Jeeps offered the T-98 which was the predecessor to the T-18. If you could find the parts, that would seem the logical choice if you must have a truck 4-speed.

Why do you want a transmission swap at all? The factory T-90 is adequate for the F134 IMO. Not judging - I suggest you give us a little more about what you want from this Jeep.
 
As per 68BuickV6. What are your plans for the Willys? In addition to the Teralow gears, if the 2A has the stock T90A, you could directly swap it for the T90C and go from the original 2.79:1 first gear to the 3.34:1 first gear with out any modifications. All of the 4 speeds are somewhat major surgery.
 
Just want a four speed for hunting. There is alot of old railroad grades from the turn of the century that are hard to negotiate, not muddy but alot of turning. Granny gear would be a plus
 
The stock 2A CR is 36.5:1 (2.79x2.43x5.38), with the Teralows/T90C (3.34x3.15x5.38) you get a CR of 56.6:1, the T98 and stock D18 nets you 83.7:1. IMO, unless one is into serious rock work, that 56.6:1 CR will be more than sufficient even with the anemic 134's.
 
T98-A is certainly the best low geared 4 speed you can put behind a Jeep 134. It’s the first and foremost rock crawling Jeep transmission since 1956 CJ5/6.
It is by far the easiest yet remains as a tough retrofit into any cj5:6. It is notably harder yet to fit into an earlier flat fender.
They’re an aweful lot of detail that needs be addressed. Crossmember, rear engine support, propeller shafts, park brake, fuel tank, floor modification, seat modification, special clutch control and the list goes on.
If you’re only after low trail gears then by all mean consider T90 C and or Tera Low gears.
The T98-A will put you into true hard core rock crawling.
I have a flatfender with a retrofitted T98-A,
I ran the Colorado Fall Color Tour with it last year.
Never even used 4WD ( it’s Powr Lok’d ) on any trail nor did I ever need put it into low range. It’s that slow without using the transfer case.
 
T98 is the only option for the layman. From the engineering aspect if you give me a level long enough I can put a L134 in front of a NV4500 and you can stretch the frame to match.
 
You might contact Herm and clarify whether he's offering a T-98 or T-18. The T-18 is more widely known than the T-98, and it's possible T-18 is in the page title to get more page views.The T-98 is the predecessor to the T-18 and functionally equivalent, just older.
 
IMHO you are going to be MUCH better off finding an original T98-A CJ-5 to strip for all of the required optional parts.
All other 4 speed transmission choices including T-18 are going to require a lot of custom machining and fabrications.
FWIW I will likely be selling my 1953 F134 T98-A CJ-3B due to other Jeeps I have that are near complete.
 
garage gnome said:
I thought Novak or someone offered a kit to put an NP435 behind the 4cyl too?
Click to expand...
I think it was discontinued a few years back. I tried finding it to post a link (because IMO the NP435 is a worlds-better trans than a t18/98), and it’s like it has been scrubbed from the internet.
 
20240712_134107_qkbJJ0Gm87_TqYdozR89v.jpeg Herm does offer a complete ready to bolt in unit. He makes 4 cyl input shafts and has all the adapters. I currently run an F-head, t98, 18 with an overdrive and 4.88 gears in a very stock looking 54 CJ3b. It makes the best overall driving experience that I have found in a universal Jeep.
 
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