435 / T 18 - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 01-08-2001, 03:32 AM
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435 / T 18

anyone know which of these trannys is stronger / better overall / drawbacks? i have both a 1982-ford 435 and a 1985-ford T18

the T18 has some minor chipping on all the teeth of the leading edge/nose of the 1st gear, gear. will this hurt the thing?

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post #2 of (permalink) Old 01-08-2001, 07:53 AM
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Re: 435 / T 18

I researched this subject a lot when I swapped trannies; it came down to those two for me; the only negative thing I heard in talking to many people was that the NP 435 could have problems popping out of first gear when in low range for an extended period of time. The guys around here who build those trannies for a Jeep do a slight internal modification to get around that problem. The grannies are fairly close, I think 435 is 6.59 and T-18 is 6.32. The only other difference was 435 has an aluminum shift cover plate, T-18 is cast.

I love my T-18; it's the only thing saving my crawl ratio right now.


82 CJ, some stuff stock, some stuff not
Have you hugged your Jeep today?
http://members.fortunecity.com/patrol14/index.html; might be looking for a new one after Thursday
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post #3 of (permalink) Old 01-08-2001, 08:13 AM
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Re: 435 / T 18

both are good trannys and the np435's are prone to walking out of first gear when in low range. it is an easy fix though. the t-18 has a 6.32to1 first gear and the np435's is 6.69to1.

brian wilson
80 cj5 "high 5"
stretched to 100" wb
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post #4 of (permalink) Old 01-08-2001, 03:16 PM
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Re: 435 / T 18

The problem with NP435's walking out of gear can be attributed to the input shaft provided by Advance when adapting it to Jeeps. They have finally admitted that machining tolerances weren't tight enough on many of their input shafts and is causing the problem. If you do have this problem they won't just take your word that their shaft is the problem though. They make you pull it out and send it to them for measurement. I haven't heard of anybody's claim being denied though.

'75 CJ5,258 w/Howell EFI,T18a,4.27's,33's,On-board air,Warn 8274
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