New best, the inevitable = an upgrade needed

[Roughbird72]

I haven't been on in quite awhile, last post was about going from an 850cfm to 1000cfm carb. Early in the year I made a gear change from 4.10 to 3.91 to bring trap rpm down and it did without performance loss.
I was invited to a prepped TnT at our local track, I did a little tinkering and the air was great. Personal best prior to today was 11.26. I ran a new best of 11.08 @123.25, but on the 5th pass the 8 3/4 inevitable happened.

Who out there has the best deal on Dana 60s!?

 

[Ironbuilt]

https://www.strangeengineering.net/product/s60-rear-end-spool-40-pro-race-axles-no-mounts.html/

 

[1967coronet440]

Just curious how tall is the tire?

 

[1967coronet440]

And I vote for a strange s60 also, I may be biased though.

 

[33 IMP]

Don't forget to get your 727 checked out.

 

[33 IMP]

Ironbuilt, you do know that's a 9" in the box, right? Lol.

 

[Ironbuilt]

Ironbuilt, you do know that's a 9" in the box, right? Lol.

Yeah, I noticed it after I posted it. Sad part is, that is the picture that Strange had on their site for the S60.

 

[Roughbird72]

Don't forget to get your 727 checked out.

That's on the to do list too. Hopefully I'll get lucky and the case won't be broke.

 

[Roughbird72]

Just curious how tall is the tire?

MT 275/60 ET Street

 

[1967coronet440]

What kind of rpm through the traps with both 4.10&3.91?

 

[Tex013]

Nice effort , shame about the end result

Tex

 

[Roughbird72]

What kind of rpm through the traps with both 4.10&3.91?

Early in the year, 6670-6710 with 4.10s
This weekend, 6350-6400 with 3.91s

 

[biomedtechguy]

I checked with Moser, Strange, and maybe another rear axle assembly company and wound up going with Quick Performance for the rear axle assembly for my wife's GTO.
I would definitely check with Quick Performance before you spend your money elsewhere. They saved me $1,000 and that was with quite a few upgrades at extra cost over the cost of the other companies. That was a Ford 9" based rear axle assembly. I already have a Dana 60 in my Roadrunner, it is a Track Pack V-code car.

 

[dvw]

I'm cheap , Dana from the scrapyard and do it myself. Actually I've run 8 3/4 in cars with similar performance. Never broken one in that context.
Doug

 

[Roughbird72]

I'm cheap , Dana from the scrapyard and do it myself. Actually I've run 8 3/4 in cars with similar performance. Never broken one in that context.
Doug

Doug, I'm pretty sure I shelled some teeth on the ring gear. It felt and sounded like it. The track operator said the car hooked, went about 4' and shuttered real bad.
One buddy of mine said it sounded horrid.
Jeff

 

[dvw]

Agreed, probably better to upgrade. I'm to point I've broken 2 sets of Dana gears. Time to step up to a pro-gear. The street gears don't seem to like mid 1.2 60 fts.
Doug

 

[Roughbird72]

Agreed, probably better to upgrade. I'm to point I've broken 2 sets of Dana gears. Time to step up to a pro-gear. The street gears don't seem to like mid 1.2 60 fts.
Doug

That's probably a good idea for the power level your car is at.

 

[383man]

Congrats on the new best. Sorry about the rear. You have enough mph for easy 10.80's as I have run in the 10.80's at 123 mph and 10.70's at 124 mph. Ron

 

[dvw]

Took the cover off mine yesterday. Found one pinion tooth laying in the bottom of the housing.
Doug

 

[Roughbird72]

Took the cover off mine yesterday. Found one pinion tooth laying in the bottom of the housing.
Doug

I'm guessing I got a few laying in the bottom of the housing
I'm not going to dig into mine until after Thanksgiving. Got a few things to do around the house before winter and deer season is coming up.