The rearend gear change will cost you about $700 in parts, then you need to install them for a gear ratio of 3 55.
Another option is a T-5 out of an S-10 along with a rear out of an S-10 4X4 or mid 70's camaro, firebird cutlass etc. Weld new spring perches on to fit your truck. My T-5 is still on the garage floor. The truck it was in cost me $100. I don't know how much the Buffalo Enterprises tranny adaptor is to make the t-5 fit my 216...By the time you buy the tranny adapter parts, tranny, rear end and have the rear end welded up, you might be sorta close to paying for PAtricks 3 55 gear set. My problem is I have never rebuilt a rearend. I pay $700 and still might wind up paying another major chunk of cash to get it all installed.
Do a search on this topic with T-5 as keyword if you want more info on a T-5. Numerous owners on here have done it with great results.
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