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defgh1 · 03-30-2008, 09:41 AM

If you want to convert from 18 to 25 spline you will need a 25 spline Bell housing and output shaft for your transmission since the 25 spline output shaft is larger. You will also need to modify the input spline of the transfer case from 18 to 25 spline. The 300M shaft is pretty stout even in the 18 spline version and will handle a fair amount of HP. However, the stock transfer case (TC) will always be the weak link. Regardless of what you do, I would seriously consider upgrading your TC to the SS or Billet Aluminum case. In my experience, the stock cast aluminum TC housing will not take much abuse even with a housing bracket.

Doug H

03-30-2008, 09:41 AM	#2 (permalink)
defgh1 Senior Member Join Date: Mar 2002 Location: Dunnellon, FL Drives: 99 VR4, 04Volvo V70R Trader Rating: (7)	Re: Convert from 18 splines to 25 If you want to convert from 18 to 25 spline you will need a 25 spline Bell housing and output shaft for your transmission since the 25 spline output shaft is larger. You will also need to modify the input spline of the transfer case from 18 to 25 spline. The 300M shaft is pretty stout even in the 18 spline version and will handle a fair amount of HP. However, the stock transfer case (TC) will always be the weak link. Regardless of what you do, I would seriously consider upgrading your TC to the SS or Billet Aluminum case. In my experience, the stock cast aluminum TC housing will not take much abuse even with a housing bracket. Doug H __________________ 91 Sandstorm TT, 431 AWHP, 433 ft-lbs. , Kormex 25 spline,LSD, RPS CC Clutch, 4 bolt conversion, Super 15Gs, Stage 3 heads, DSM Sidemounts, PST Driveshaft, Blitz DSBS, HKS Exhaust, 3SX Downpipe, Supra Pump, 780 cc PTE Injectors, SX Fuel reg. & dual feed, AEM, Duel WJO Wideband, HKS DL1, Alcohol Injection. Photos: -->