what gear ratio did the 6HL code get...was it rear disc?

 

I cannot find the RPO "6HL" in the '84,'89,or'91 factory service manuals. Generally your gear ratio RPO codes will begin with a "G". Codes that begin with a "6" appear to be spring related and the rear disc brake RPO is "J65", one of which I recently scored at a wrecking yard with Posi and 3:42 gears($300). It will be going in the Z just as soon as it comes back from the paint shop!

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"84Z28/'91 305TPI comp cam flowmaster TB coolant bypass/shutoff valve to heater core MAT relocated Ram-Air(home-made) gutted air-box IROC ground effects/wheels GY245/50's 700R4 superior shift kit/ corvette servo(excellent shift kit BTW) Rebuilt engine and transplanted it myself. Love this engine!
LOW performance people should drive low performance vehicles!

[This message has been edited by 84IROC (edited October 11, 2000).]

 

I'm assuming the code is from the axle tube. The axle tube code won't tell you if it's disk brake or not. You need the RPO code J65 for rear disk brakes.

6HL axle code:
1984 3.23 locking diff (could be posi or open locker)
1988 2.77

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Stephen's racing page

87 IROC-Z Pro ET Bracket Race Car and knocking on the SuperPro ET class
383 stroker (carbed) with double hump cast iron heads and pump gas
LS6 Big Block buildup now in progress

Best results before the engine blew up
Best ET on a time slip: 11.857
Best corrected ET: 11.163
Best MPH on a time slip: 117.87
Best corrected MPH: 126.10
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!

Member of the Calgary Drag Racing Association