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#1
10-01-21, 20:03
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M38A1 Warner T90 transmission
I’m currently overhauling my jeep transmission and have discovered a bit of a quandary, looking for some assistance.
The manual specified that the transmission is supposed to be a Warner T90C. My trans is tagged on the top cover with T90C data plate. Now, here is the issue- A T90C has a 35 tooth cluster gear and a 16 tooth input gear. A T90A has a 33 tooth cluster gear and a 18 tooth input gear. Mine has the 33/18 set which would make it an A model transmission. It seems that for whatever reason I have this set, wondering if the CF rebuilt it as an A model, was this an earlier transmission that was swapped, did they play mix and match or did they come ordered this way? My jeep is a 1970 Cdn3 model. The transmission appears to be original equipment Ideas anyone?
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3RD Echelon Wksp 1968 M274A5 Mule Baifield USMC 1966 M274A2 Mule BMY USMC 1966 M274A2 Mule BMY USMC 1958 M274 Mule Willys US Army 1970 M38A1 CDN3 70-08715 1 CSR 1943 Converto Airborne Trailer 1983 M1009 CUCV 1957 Triumph TRW 500cc RT-524, PRC-77s, and trucks and stuff and more stuff and and....... OMVA, MVPA, G503, Steel Soldiers 
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#2
10-01-21, 20:55
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Did some more digging and some consultation with another Think I just answered my own questions lol
I just went back and consulted the piece of crap Canadian manual about the transmission. The manual stipulates it as a T90C. I started looking at the gear ratios given. 1st 2.79 2nd 1.55 I went to Novak and looked up the specs for the various models. It clearly states a T90A1 model is 2.79 and 1.55 The C model is supposed to be 3.34 and 1.85 Not sure why they call the Cdn transmission a C model when it clearly isn’t. Weird the case is tagged C and the manual says C yet the ratios line up with OEM specs in both the A model and the Canadian army manual spec.
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3RD Echelon Wksp 1968 M274A5 Mule Baifield USMC 1966 M274A2 Mule BMY USMC 1966 M274A2 Mule BMY USMC 1958 M274 Mule Willys US Army 1970 M38A1 CDN3 70-08715 1 CSR 1943 Converto Airborne Trailer 1983 M1009 CUCV 1957 Triumph TRW 500cc RT-524, PRC-77s, and trucks and stuff and more stuff and and....... OMVA, MVPA, G503, Steel Soldiers
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#3
10-01-21, 21:23
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transmissions
Just to add a layer to the conversation, at Sherbrooke Hussars we had a 67 M38A1 (IIRC) which had a longer shift lever than every other 67 or 70. It was just different. I don't recall its performance, but that Jeep had a good reputation, and I can visualize the throw of the shifter in the hand of a good driver.
Is the shift lever a factor in your transmission question?
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Terry Warner - 74-????? M151A2 - 70-08876 M38A1 - 53-71233 M100CDN trailer Beware! The Green Disease walks among us! Last edited by maple_leaf_eh; 11-01-21 at 02:48.
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#4
20-03-21, 12:57
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I wish I read this post a week ago! I discovered the exact same as you. Case tagged as a C. With the gears of an A. Unfortunately it was only when I was about to install the new cluster gear that discovered the difference.
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43 universal carrier 52 m38 (recoiless) 59 m274 mule 67 m715 70 m38a1 74 Bombardier cargo track 85 cj7 (military) 85 Bombardier Iltis
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#5
23-03-21, 02:32
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Al, It is a quandry that makes no sense to me. It is what it is .
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3RD Echelon Wksp 1968 M274A5 Mule Baifield USMC 1966 M274A2 Mule BMY USMC 1966 M274A2 Mule BMY USMC 1958 M274 Mule Willys US Army 1970 M38A1 CDN3 70-08715 1 CSR 1943 Converto Airborne Trailer 1983 M1009 CUCV 1957 Triumph TRW 500cc RT-524, PRC-77s, and trucks and stuff and more stuff and and....... OMVA, MVPA, G503, Steel Soldiers
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