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T15 & model 20 vs T90 & model 18? |
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Bufordjeep 
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Joined: 12 Aug. 2009 Location: Illinois Status: Offline Points: 506 |
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 Topic: T15 & model 20 vs T90 & model 18?Posted: 18 Nov. 2019 at 4:56am |
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How much of a difference between the 15 vs 90 transmissions and the 20 vs 18 TC's in rebuilding? Have done a few 90 / 18 sets and have a 15 / 20 set to do, but the excellent YouTube videos aren't available for them.
Appreciate any insights. Bob
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oldtime
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Joined: 12 Sep. 2009 Location: Missouri Status: Online Points: 4184 |
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Posted: 18 Nov. 2019 at 3:36pm |
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T90 = 8" OAL vs T15 =10" OAL. T90 = 60 pounds vs T15 = 80 pounds.T90 first gear = 2.798 or 3.339 vs T15 first gear = 2.99 T 15 front Bellhousing adapter plate required for most Willys applications. T15 has the desireable 6 spline mainshaft (output) so its easy to add overdrive it if mated to a D18. Truth is the T15 is the strongest and finest transmission ever built that directly bolts to the "Texas" pattern. No T90 nor T15 parts interchange but rebuild is a virtually identical procedure. D20 is merely an ingenious factory modification (change) of the famous D18. The rebuild procedure is very similar with specific differences. The methods by which these 2 tranfer cases shift is one of the most notable differences. Both D18 and D20 can be easily rebuilt using the standard factory service procedures. |
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Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963) Zero aftermarket parts |
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52 M38
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Joined: 26 Nov. 2012 Location: New England Status: Offline Points: 1286 |
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Posted: 19 Nov. 2019 at 1:15am |
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Good T15 parts are hard to find. One of the shafts is essentially non existent except in garbage china form. When I was building mine I called Herm and he couldn’t even find good parts. I stumbled on a person selling a hoard of NOS stuff, I purchased what I needed and then told Herm about it. I believe he bought up the rest of it. I can’t remember if Advance Adapters started making parts.
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52 M38
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Joined: 26 Nov. 2012 Location: New England Status: Offline Points: 1286 |
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Posted: 19 Nov. 2019 at 1:21am |
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Advance Adapters has a great rebuild guide. They will send it to you in paper form, but at the time I did my T15 they would not send it digitally for fear of it being released.
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Bufordjeep
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Joined: 12 Aug. 2009 Location: Illinois Status: Offline Points: 506 |
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Posted: 19 Nov. 2019 at 3:47am |
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Appreciate the insights - thanks!
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masscj2a
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Joined: 25 Sep. 2013 Location: Chester Mass Status: Offline Points: 793 |
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Posted: 16 Dec. 2019 at 10:45pm |
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I ran a T15 behind my FI 4.3 vortex and it went into a Dana 20 case fitted with 18 guts and twin stick. Great combo. I'm hunting another as we speak. Want to put it in my 70 Dauntless.
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1946 CJ2a Dauntless aka Jalopy
1946 VEC stock 1981 CJ-8 5.3 LS 1966 CJ-6 SBC TUX 1968 CJ-6 225 V6 1974 CJ-6 4.2 1967 M-416 East Coast Modified CJ's |
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