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#1 |
![]() Join Date: Dec 2023
Location: Minneapolis
Posts: 15
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I'm planning to swap out my stock 3.45 gears for a 3.91 and have a question. Does the stock differential carrier work with any gear set? I'm hoping to avoid replacing my stock posi carrier.
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#2 |
![]() Join Date: Sep 2008
Location: Speedway, IN
Posts: 126
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From when I researched this some time back, I believe once you go past 3.73, a larger carrier is required.
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#3 |
![]() Join Date: Sep 2008
Location: Speedway, IN
Posts: 126
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#4 | |
![]() Join Date: May 2010
Location: Japan
Posts: 3,571
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of gear ratios available. It is the Dana 36 in base model autos that have limitations. https://www.corvettepartsonline.net/...-ring-pinions/
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Craig "ZR-1 NO KA 'OI" "ZR-1 ICHIBAN" 1995 #228 Black/Black with Dunn Heads ZR-1 owner since September 2003 ZR-1 Net Registry Founding Member #0074 NCM Lifetime Member #2048 ![]() |
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#5 |
Join Date: Sep 2018
Location: Florida
Posts: 304
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You should be fine. I went from 3.45 to 3.90. Yukon brand pinion and gear and there was no issue.
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#6 |
![]() Join Date: Jan 2021
Location: Beautiful Bavaria
Posts: 523
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Has anyone ever produced a step by step guide or, even better, video on how to swap gears on a Dana?
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ZR-1 #638/1991 |
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#7 |
![]() Join Date: Apr 2007
Location: Northern VA
Posts: 2,653
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Factory Service Manual is what I use. It shows pinion preload using shims. Most modern replacement gears sets now use crush sleeves for pinion preload. Plenty of videos on YouTube showing crush sleeve pinion preload setups.
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake |
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#8 | |
![]() Join Date: May 2010
Location: Japan
Posts: 3,571
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I remember you helped me out with the list of parts to rebuilt and do 4.10s in my 90Z many many moons ago. I took the assembly out to a machine shop back then to have a pro do the work. I am almost tempted to try this myself, but aren?t some special tool needed? I?ll see if I can find a shop here in Japan and did check out some YouTube videos. Thanks.
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Craig "ZR-1 NO KA 'OI" "ZR-1 ICHIBAN" 1995 #228 Black/Black with Dunn Heads ZR-1 owner since September 2003 ZR-1 Net Registry Founding Member #0074 NCM Lifetime Member #2048 ![]() |
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#9 |
![]() Join Date: Apr 2007
Location: Northern VA
Posts: 2,653
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Yes, several special tools are required. Case spreader, set bearings, inch pound torque wrench, 300 lb torque wrench, dial indicator, precision calipers, heavy duty snap ring pliers, pry bars, drifts, pinion bearing removal tool, differential case bearing removal tool, pinion depth setup tool, pinion bearing outer race install tool, side shaft bearing install tool, pinion and side shaft seal installation tools.
All are mentioned in the FSM write up. Most of these were made by Kent-Moore back in the day. FSM lists the KM part numbers. I picked up most by scouring eBay over a couple of years and made the rest in my shop. Sent from my iPhone using ZR-1 Net Registry
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake |
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#10 |
![]() Join Date: Apr 2007
Location: Northern VA
Posts: 2,653
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I was lucky back then due GM shutting down a lot of the weaker Chevrolet dealerships. Tool liquidators came in and bought up up a lot of dealerships special tool inventory and many of them ended up on eBay.
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake |
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