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Kirkham Motorsports

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  • 6 Post By 169mph
  • 1 Post By spdbrake
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  #1 (permalink)  
Old 04-17-2022, 05:24 PM
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Cobra Make, Engine: Backdraft w/ 427IR
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Default First Drive(s) after reinstalling rear differential

I took my car out for the first time after reinstalling my rear differential due to the sheared front differential bolt. I upgraded the front and rear differential bushings, replaced the diff cover (self inflicted), and cleaned up / polished the Diff output spacers (they rubbed the subframe when the bolt sheared). Replaced all bolts and washers that I removed. I'm happy to report that I only had one extra self tapping screw left over after reinstalling everything. which is very good for me.

The first drive was only in my neighborhood. Just wanted to make sure there were no leaks, abnormal grinding, brakes were working, etc...). Afterwards I checked / retorqued all bolts. The next day i took her for a 20 minute ride. Normal driving, no dropping the clutch or taking her to redline. I had no issues. Today, I drove her like she was designed for (in my opinion). She drove amazing. The only difference I noticed was when taking off in first gear. There is no shaking, I didn't have to ride the clutch. I think / I know I drove the car at least two times after the bolt sheared (not knowing at the time). It was very difficult to take off from a dead stop with bolt sheared. I'm amazed I was able to drive her with the bolt sheared without damaging the differential and or CV joints.

I really appreciate all the help!! Saved a lot of money and I learned a lot during the process. KNOCK, KNOCK ON WOOD

Thanks again, Mike
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  #2 (permalink)  
Old 04-17-2022, 05:47 PM
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Glad your fixed. Thank you for sharing the repairs and results as we all learn from these events.
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Old 04-18-2022, 09:47 AM
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I did this upgrade a few years back. Broke the same bolt when I went from the goodyear tires that came on the car to Nitto NT05r then Nitto NT01. Defiantly keep an eye on things. I next broke a mounting ear off the rear diff cover. Replaced that with a new OEM cover from BMW. Then sheered three teeth of the ring gear. I ended up doing the e36 Rallyroad bulletproof diff conversion which replaces the e36 diff with an e32 or e34 from a 7 series or a M5 respectively. It increases case size, goes from 180 to 210mm ring gear, adds in a second mounting point in the front (4 bolts total), uses a bittet rear mounting plate instead of the integrated rear arm mounting tabs. Have not had a single issue since. This kit does require welding and then milling rear output shaft spacers to be thinner as the diff is wider than an e36. Vintage Motorsports did this upgrade for me.
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Old 05-08-2022, 07:11 PM
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Last edited by blairlau; 06-17-2022 at 01:10 AM..
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Old 05-10-2022, 08:05 PM
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Cobra Make, Engine: Unique Motorcars 289 USRRC, 1964 289 stroked to 331, toploader
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Thumbs up Nice!

Congrats on the successful repair, Mike! It provides a great sense of satisfaction.
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