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Transmissions and Rear Ends Three on the tree or four in the floor? Shift it all here. |
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Looking for some guidance/ confirmation from anyone that has changed out the ring and pinion to get a little more high end out of the old girl. I’ve read through what I could find here and have talked to Jake about his setup. Not trying to get in a debate here about them being old work horses not meant for speed yada yada yada. Please keep it to the mechanics.
Seems doable than I got to reading somewhere about different thickness gears so I called spicer tech support to confirm. The gentlemen from spicer seemed knowledgeable and said to go lower than 3.92 (current setup) I would have to change out the carrier as well which they do not offer. My goal is to be able to cruise around 60-65mph. My current set up is 1960 V6 305A 4-wheel-drive with an SM420. Dana 44 front and back at 3.92. I was looking at the 3.54 part# 22856-5x or the 3.31 part# 706017-2x. Obviously my truck is 4x4 so I’d have to do both front and rear. Could get pricey and I don’t want to start pulling things apart to find I didn’t order the right stuff. If someone could confirm they have done so and specific parts it would be greatly appreciated. I’ve also considered putting a gear vendor overdrive so I gave them a call. Their bolt on over drive is 14” long (and back ordered for several months). Taking 14” out of the drive shaft would put it at a pretty sharp angle. Not sure I am comfortable doing that. (See pics) Thoughts? Regards, T.J. |
#2
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Ed Snyder Medford, Oregon 1962 K1000 Suburban 401M & SM420 1965 2500 Suburban 351C & SM420 with Watson overdrive 1967 CM1500 pickup 351E & NP435 |
#3
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A lot of good info here http://www.billavista.com/index.html
To my knowledge the same carrier works with 4:10 and down, so if your going from 3:92 to 3:54 you should be able to use the same carrier.
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63 GMC V6 carryall 64 GMC V6 LWB 66 GMC SWB BBW buddy buckets |
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