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tim_mc · 07-09-2021, 08:08 PM

Just picked up mine from Custom Differentials in Bloomsdale, MO. Jeremy's team upgraded my 12-bolt open diff 3.08 to a 3.42 posi. No more whine and now 2-wheel peel! The old pinion bearing was heading south in a hurry. I can now hear myself think while cruising down the interstate. I also needed new axles. Tomorrow I'll pull the speedo cable on the 700R4 and see what driven gear is in there since my speedo is fast by about 15%. Per the rule, add 1 tooth for every 5% difference if the speedo is faster than actual. Thanks Jeremy!

07-09-2021, 08:08 PM	#2244
tim_mc Registered User Join Date: Jan 2019 Location: St Peters, MO Posts: 436	Re: What did you do to your truck today.The 3rd chapter Just picked up mine from Custom Differentials in Bloomsdale, MO. Jeremy's team upgraded my 12-bolt open diff 3.08 to a 3.42 posi. No more whine and now 2-wheel peel! The old pinion bearing was heading south in a hurry. I can now hear myself think while cruising down the interstate. I also needed new axles. Tomorrow I'll pull the speedo cable on the 700R4 and see what driven gear is in there since my speedo is fast by about 15%. Per the rule, add 1 tooth for every 5% difference if the speedo is faster than actual. Thanks Jeremy! Attached Images __________________ 1967 C20, 350 SBC w/Comp roller cam, 700R4 w/3.42 posi, PS, 4-wheel PDB, Old Air AC & GM Tilt column.