Transmission Shopping Question? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

derick1 · 01-20-2013, 04:12 PM

So Im shopping for a SB and and transmission. Going to go with a 383 stroker about 375HP and 490TQ. Now I have at TH400 mounted to what I think is a NP205.

So to my question is there an equal tranny that has a 4th gear or overdrive that the drive shaft will still work or am I goning to have to get a new drive shaft?

oh and its a 8ft bed

**jocko** · 01-20-2013, 05:49 PM

Are you saying you have a 4x4 with a TH400? Normally, K's came with TH350s. It's not a simple task to swap in an O/D trans in a 4x4 due to t-case, but it is doable. Keep in mind that the T-case will normally stay in the same spot, but the engine may have to move fwd a bit, and there is room. Advanced Adapters makes a nice adapter to make it all work also - but it is a big job. See these threads for some very helpful info:
http://67-72chevytrucks.com/vboard/s...d.php?t=128495
http://67-72chevytrucks.com/vboard/s...d.php?t=504669

derick1 · 01-20-2013, 06:39 PM

yep I have a TH400 tranny in a K. Now I think that the chasis is a newer year model but I have no idea how to tell or find out what year model it is

01-20-2013, 04:12 PM	#1
derick1 Registered User Join Date: Aug 2012 Location: St. Robert, MO Posts: 32	Transmission Shopping Question? So Im shopping for a SB and and transmission. Going to go with a 383 stroker about 375HP and 490TQ. Now I have at TH400 mounted to what I think is a NP205. So to my question is there an equal tranny that has a 4th gear or overdrive that the drive shaft will still work or am I goning to have to get a new drive shaft? oh and its a 8ft bed

01-20-2013, 05:49 PM	#2
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,969	Re: Transmission Shopping Question? Are you saying you have a 4x4 with a TH400? Normally, K's came with TH350s. It's not a simple task to swap in an O/D trans in a 4x4 due to t-case, but it is doable. Keep in mind that the T-case will normally stay in the same spot, but the engine may have to move fwd a bit, and there is room. Advanced Adapters makes a nice adapter to make it all work also - but it is a big job. See these threads for some very helpful info: http://67-72chevytrucks.com/vboard/s...d.php?t=128495 http://67-72chevytrucks.com/vboard/s...d.php?t=504669

01-20-2013, 06:39 PM	#3
derick1 Registered User Join Date: Aug 2012 Location: St. Robert, MO Posts: 32	Re: Transmission Shopping Question? yep I have a TH400 tranny in a K. Now I think that the chasis is a newer year model but I have no idea how to tell or find out what year model it is



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