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I have tried Google, Summit, Amazon, Local Parts Stores, couple corvette
parts supplies and had no luck. I think Jeg's had them at one time.
Where can I find a 3:9x ring and pinion set?
What number goes in place of the x? 3:90?
Anyone know a shop in Colorado that can CORRECTLY change the gears?
Im leaning towards calling a dealership.
From what I have read 4:11 are a little to low. I don't drag race the car and 3:73's
don't make enough difference to justify the change. I have 3:42's.
I have had the car up to 145 in 5th gear. 6th gear is pretty much pointless.
Seems like a lot of wasted power going with 3:42's.
I have tried Google, Summit, Amazon, Local Parts Stores, couple corvette
parts supplies and had no luck. I think Jeg's had them at one time.
Where can I find a 3:9x ring and pinion set?
What number goes in place of the x? 3:90?
Anyone know a shop in Colorado that can CORRECTLY change the gears?
Im leaning towards calling a dealership.
From what I have read 4:11 are a little to low. I don't drag race the car and 3:73's
don't make enough difference to justify the change. I have 3:42's.
I have had the car up to 145 in 5th gear. 6th gear is pretty much pointless.
Seems like a lot of wasted power going with 3:42's.
Might help me google, if I knew the last number.
Now it appears that many do offer a 3.90 (39/10) (Yukon and Dana - others? likely) for Vette/Viper. An original 3.92 D44 (47/12) was a 26 spline that required specialty bearings and welded sleeve for a C4 install. I do think that Dana/Spicer actually did (may still do) offer a 3.91 (43/11) but in a correct 29 spline pinion. Might now be obsolete.
You need to watch for 3/8-24 bolt ring gear applications and some are dual (3/8-24 and 7/16 for later Viper/CMC builds).
Your differential case will be fine!
Vette/Viper only, 29 spline pinion and 3/8-24 ring gear bolts.
What rpms are you seeing at 75 mph with 4:10 range?
I do a lot of hpde and don't want to kill top end. I never 1/4 mile the car. I still want to be able to hit 140mph in 6th. Current 3:42 will do 150 in 5th.
Just over 2K. For you though I would use a calculator to determine your shift points before choosing as it is not all straightaways you are dealing with. Also your RWHP and TQ will determine how well it will pull when in 6th and at a .5 drive.
Thanks for the info WVZR-1.There is a 4x4 shop in the same complex as mine and I was wondering if I got a cheap r&p out of a Jeep Rubicon if I could use the gears.There is a big difference in $ between a gearset for a D44 or a set for the d44hd( Viper) diff.I will put a post up with side by side pics of the parts when I get mine apart.
What rpms are you seeing at 75 mph with 4:10 range?
I do a lot of hpde and don't want to kill top end. I never 1/4 mile the car. I still want to be able to hit 140mph in 6th. Current 3:42 will do 150 in 5th.
You want no part of high speeds relying upon 6th gear. Just forget it. It's not intentioned for that. Do everything you want to calculate based on 5th gear. 6th and 150+MPH will likely "smoke a ZF" if done for any duration at all.
Thanks for the info WVZR-1.There is a 4x4 shop in the same complex as mine and I was wondering if I got a cheap r&p out of a Jeep Rubicon if I could use the gears.There is a big difference in $ between a gearset for a D44 or a set for the d44hd( Viper) diff.I will put a post up with side by side pics of the parts when I get mine apart.
There's some gear sets that will interchange but there's no "gospel". I've never had a later Jeep to stand side by side (carriers) to satisfy the gear set that might work. Someone local here was given some information OR he found it here and had all of the Dana info from the Jeep that was supposed to fit and it all matched but it was a "no go". I never saw the parts 1st hand but the fellow does pretty good work and is quite thorough.
I have some thoughts on what will and what won't but nothing side by side to confirm. The Nissan's might have a very nice low numbered 3.20's, 3.10's & 3.30's something. I've seen Isuzu used with no problems and a 4.10 I have here now I'm quite sure is an Isuzu gear set (Dana/Spicer).
The Super 44 gear set for the 3.91 I'm quite sure is a 43/11 set up.
Your calculations "jogged my memory" and the 43/11 combination came back to me. My 3.92 (3.90/3.91 whatever) was a 26 spline build 47/12 (3.9166666) with the welded sleeve and older school stuff.
You can likely alter the PCM for correction OR if you rather not TINKER with the PCM do an ERA/DRA. A mechanical correction could be done if you stuck with OE tire dimensions and chose these ratios:
You can run into an engineering problem if you depend on a 6th gear and buzz the driveshaft up to alot of rpm.It depends on the length + diameter of the tube+balencing.
C4 ring and pinion options?
