Low gear set 904, pro’s and Con’s
You will have a bigger drop on the gear changes, if your converter is plenty loose its likely not a big deal, if it is borderline that might erase any gains. Do you think a looser converter would help more than the gearset? I have considered the lower gear because my car is out of gear up top but my 60ft is a best of 1.41 and I don't want to mess that up. So in my case I could put a taller rear gear in and get my SLR back with the trans gear set. My car is 3550lbs.
The biggest issue with increasing the SLR is the increase in torque at the rear tires.
When Dave Morgan released his “Doorslammers” book, he advocated for a a lot of things that proved to be…how can I say this to keep the trolls at bay…things that proved to be on the “safe” side of things or at least he advocated for them for expediency sake.
One of those was his notion that on a 4 link the bottom bar should be installed parallel to the ground so that you could move the Instant Center front to rear and not make any other changes.
Sadly, that was poor advice and he actually corrected that when he was head of IHRA’s technical department. If you go back and find the IHRA equivalent of NHRA’s National Dragster you can find it. The year had to be late 2001 to late spring 2002.
Along those same lines, his advocacy for IIRC a 9:1 SLR for most anything has proven to be at best a simplified standard.
If you can adjust and tune your chassis/shocks you can run far more SLR than his standard.
But you have to be able to control the suspension to do it.
During the big move to everything Powerglide you had the same thing. Guys started making more power with more displacement and the chassis and shocks weren’t capable of dealing with more starting line ratio.
