You come to the right place! If you want to change to the 4.10 ratio, we have the following package:
1- GM 8.5 4.11 gear
1- GM 8.5/8.6 master install kit
1- GM 8.5 Truetrac
1- GM 8.25 IFS 4.11 gear
1- GM 8.25 IFS master install kit
Total: $784.99
Free shipping to LS1 members.
Thanks!




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