what trans do I have

purg113

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it is a 4 speed H pattern no overdrive with a very low granny 1st gear.
it is on my 89 f350 4wd bolted to a 460.
 

towcat

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it is a 4 speed H pattern no overdrive with a very low granny 1st gear.
it is on my 89 f350 4wd bolted to a 460.

sounds like a T18
check out he top cover gasket contours.......
 

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Coyote_Red

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T-18 will have an iron case and top cover, a straight cut unsynchronized 1st gear.
T-19 will have an iron case and top cover, a helical cut synchronized 1st.
NP-435 will have an iron case and an aluminum top cover, straight cut unsynchronized 1st.
It should be one of the T series Brog Warner.
 

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