The Tempest in Post #15 is Paul Glasgo’s super quick Magnum 400 tribute. Paul’s Tempest Hardtop (called T-37 when introduced in Spring 1970) was a 350 2-bbl/ TH350 car originally, so had the gray iron center section with 2.56 gears. There are a couple of magazine write-ups about the car online to read more about the build. At the 2017 Pure Stock Drags Paul pretty much destroyed the gray iron center section during the burnout, but this is after 10 years of drag racing the car at our race, F.A.S.T. races, and other events (Hemmings Muscle-palooza’s, Tripower Nationals, etc.). From our information (the tech card every racer fills out at the race), Paul listed the trans as 4-speed and the rear end as 3.90, so a recent change from the TH400/4.10 he was originally running in the car. That 8.2” 10-Bolt took more of its fair share of abuse and the new 4-speed probably was the final straw the broke the 10-bolt’s back.
My carnage story...my ’70 Lemans 4-dr sedan came from the factory with an M20 4-speed trans and a 3.23 Safe-T-Track 8.2” 10-bolt rear end (with the grey iron center section). It survived well behind the original 350 2-bbl engine. In 2015 we swapped in a rebuilt ’70 YH code 360 hp 455 (small valve) from a Bonneville that dyno’d at 390 hp and 512 lbft of torque which that caused major havoc to that rear end. All it took was one eased-in full throttle blast from a roll in 1st gear that brought on the most extreme wheel-hop I had ever experienced for just a split second. I got out of the gas immediately and there was a clunk and a side-to-side shimmy as I came to a complete stop. After letting it sit a minute, I then just eased it back home. Fortunately, it didn’t make any more noises or lock up on me. The 10-bolt came out soon thereafter and we sent a 3.07 12-bolt from a ’70 GP out to be rebuilt along with a new driveshaft made. We haven’t opened up the original 10-bolt rear end yet, but we know there was some damage done, maybe a tooth or two off the ring gear…?
Dennis
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