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  #1  
Old 10-01-21, 20:03
chris vickery's Avatar
chris vickery chris vickery is offline
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Location: Nipissing Ontario Canada
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Default 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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1968 M274A5 Mule Baifield USMC
1966 M274A2 Mule BMY USMC
1958 M274 Mule Willys US Army
1970 M38A1 CDN3 70-08715 1 CSR
1981 MANAC 3/4T CDN trailer
1943 Converto Airborne Trailer
1983 M1009 CUCV

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  #2  
Old 10-01-21, 20:55
chris vickery's Avatar
chris vickery chris vickery is offline
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Location: Nipissing Ontario Canada
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Default

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
1958 M274 Mule Willys US Army
1970 M38A1 CDN3 70-08715 1 CSR
1981 MANAC 3/4T CDN trailer
1943 Converto Airborne Trailer
1983 M1009 CUCV

RT-524, PRC-77s,
and trucks and stuff and more stuff and and.......

OMVA, MVPA, G503, Steel Soldiers
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  #3  
Old 10-01-21, 21:23
maple_leaf_eh maple_leaf_eh is offline
Terry Warner
 
Join Date: Mar 2004
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Default 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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Last edited by maple_leaf_eh; 11-01-21 at 02:48.
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  #4  
Old 20-03-21, 12:57
Al Dornan's Avatar
Al Dornan Al Dornan is offline
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Location: Montreal
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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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  #5  
Old 23-03-21, 02:32
chris vickery's Avatar
chris vickery chris vickery is offline
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Location: Nipissing Ontario Canada
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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
1958 M274 Mule Willys US Army
1970 M38A1 CDN3 70-08715 1 CSR
1981 MANAC 3/4T CDN trailer
1943 Converto Airborne Trailer
1983 M1009 CUCV

RT-524, PRC-77s,
and trucks and stuff and more stuff and and.......

OMVA, MVPA, G503, Steel Soldiers
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