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Old 11-14-2006, 01:28 PM   #2
Yukon Jack
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Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,689
Re: 3 on the tree to 4 in the floor swap

Welcome to the board. I took my 3 on the tree out of my 69 K20 and put in a 4 speed (SM465). You will need to get the 4 speed + the adapater to mate it to the NP205. I was told the 3 speed manual had a different size opening on the bellhousing - but others said that it would be the same as the opening on a bellhousing for a 4 speed manual. Your overall lenght shouldn't change as the adapters are a little different lenghts which keeps the overall lenght the same (at least it did on my truck but I have the Rockwell transfer case rather than the NP205).

The SM465 has the very low 1st gear - granny gear. You can look at newer 5 speeds but they are fairly expensive and you will have to get a costly adapter.
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