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Thinking about swapping my three on the tree for a four-speed, Were four speeds available behind slant sixes in 61 D100's?

61stepside wrote:Thinking about swapping my three on the tree for a four-speed, Were four speeds available behind slant sixes in 61 D100's?

My '61 Slant Six D200 came originally equipped with a NP420 4spd tranny. It is not
synchro'd in 1st or 2nd gear though. If you could find a NP435 4spd that has provisions
for the parking brake drum, it would be a good candidate, as its synchro'd into 2nd gear.
These Sweptline trannys will bolt to your current bell housing. Your drive shaft length
may possibly need to be addressed. You'll need to find a drive line tunnel
cover with the hole for the shifter. Try the Parts Wanted section. As a caution, the
larger series NP trannys might have too large of an input shaft. Someone who owns
a 400 or larger truck might be able to fill you in.
John

400 series and larger do indeed have a larger input shaft clutch spline. Might still be able to use that style trans but out put yoke is very large for U joint.
Not sure if smaller U joint yoke can be installed on output.

I have the 435 with the e brake. pm sent