Update: 1992 FLSTC Interstate Challenged

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Aug 15, 2016 | 10:51 AM

#11

Uncle G.

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From: Upstate New York

Quote:

Originally Posted by Owtlaw

Final drive ratios on Softies and Touring are the same, I believe. The ratio went from 3.36 pre 94 to 3.15 94 and later. (Change was in the primary, BTW) I'm doing this by memory, so if the ratios aren't exact, I know they are close.

The ratios are and aren't the same depending on the year in question, so you're both right, sort of.

From '84 to '92, all big twins had a 3.38:1 final ratio. In '93 Softails changed to a 61 tooth rear pulley giving them a 2.94:1 final ratio, Dynas and baggers remained 3.38:1. In '94 the MoCo added a tooth to the front primary sprocket on all big twins and reverted to the 70 tooth rear pulley on the Softails, so all '94s had a 3.15:1 final ratio. From '95 to '99 the Softails used a 65 tooth rear pulley for a 2.95:1 final ratio while the other big twins stayed with the 3.15:1 ratio.

This applies to US/domestic models only. International models had different final gearing depending on region.

Last edited by Uncle G.; Aug 15, 2016 at 10:59 AM.