4 speed tranny

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jay_dufe

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Jun 3, 2003
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I bought a 73 fj40 with a chevy small block 350 and three speed. This has the adapter on it already My question is can i replace it with my four speed tranny and transfer case(from my 77 fj40) will that swap right in without moving any thing or getting another adapter.
Thanks jay dufe
 
Pin_Head

Pin_Head

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Feb 6, 2002
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No, you will need a new adaptor. This can be as simple as a machined aluminum ring that bolts on to the 4sp bearing retainer (using allen head boltswhich you will need to grind slightly after tightening) and a 1/2 inch spacer under each of the tranny mounting ears. OTOH, an sm420 or sm465 will bolt right up to a GM bellhousing (420 and 465 use different ones), but you will need an adaptor for your transfer case.
 

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