Originally Posted by BradH
Is a Strange S-60 more efficient than an 8.75", as in enough to help offset (some of?) the weight difference?

I'm trying to calc some target ET & MPH #s for my new combination. I know the Strange S-60 conversion has added some weight (not sure exactly now much; estimating 50#s) compared to my old 8.75". Neither old or new diff use spools; 8.75" had Power-Lok and S-60 and Strange has S-Track.

However, I've read here that a Dana 60 is more efficient than an 8.75" and the ETs are usually very close, despite the weight increase. True?


Ran an 8.75 forever( well sorted car) broke it. By the following race weekend a Dana was installed. Despite being heavier, i saw absolutely zero difference in time slips. As if i never made the swap regards, incrementals, MPH, ET, you name it.
So it must be more effecient to weigh 60-70 pounds more and have zero impact on my slips
This was running 10.40’s at the time

Last edited by B3422W5; 10/21/19 09:14 PM.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, low 10.30’s 1/4
1.41 best 60 foot
6.56 at 104.17