1MeanZ

Hey all, I'm using a .73 OD T5 trans in my '91 Trans Am with a 2.73 gear. The correct output shaft and VSS gears are not available for this combination, so I am going to have to modify the VSS signal somehow. I have been reading up on using a DRAC and it seems like it might work, but I have one question. Most people seem to be using the DRAC when they have a 40 tooth reluctor wheel (40 pulses per rev). Since my VSS is gear driven how will I ever find out which DRAC jumper setting will work for me? The input ratio calculations do not account for a gear driven VSS. Is the DRAC right for me? Are there other options? Thanks for the help guys.

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86 IROC, Superram 383 450hp/500tq, TKO 600- Daily Driver, autocross, open track days. C4 IRS swap in progress

91 Trans Am, LB9/T5- Already lowered, with Konis, headers and exhaust on the way.

tequilaboy

17/35, 17/37, 18/40 or 19/42 gears should be close. What size tire?

1MeanZ

I dont have the ~2" speedo gear. i have the 7/8" speedo gear. So I'd need the red 9 tooth drive gear with a 19 tooth driven gear which is not offered. I contacted these guys about it today
http://www.transmissioncenter.org/GM...eter_Gears.htm

They recommended this...
http://www.transmissioncenter.net/sp...n_______va.htm

It is a $169 pulse modifier. I'm sure I can do the DRAC cheaper, assuming I can make it work with my current speedo gears....

EDIT: my tire size is 26.6" dia.

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86 IROC, Superram 383 450hp/500tq, TKO 600- Daily Driver, autocross, open track days. C4 IRS swap in progress

91 Trans Am, LB9/T5- Already lowered, with Konis, headers and exhaust on the way.

RBob

A DRAC won't work unless your setup is close to a 40 pulse per driveshaft revolution. A 2K PPM or 4K PPM won't work with a DRAC.

RBob.

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www.DynamicEFI.com

'92 Camaro in Dark Green Gray Metallic

1MeanZ

After I had searched for a while and started to learn a bit, thats what I was afraid of. Thanks for clearing it up for me RBob. And by the way, I sincerely appreciate your input. I don't think people say that enough around here. Guys like you are what have made this site one of the best information sources on the web. I appreciate your time, and your knowledge.

Looks like I'll be using a Dakota Digital box to correct this issue unless someone has a better idea.

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86 IROC, Superram 383 450hp/500tq, TKO 600- Daily Driver, autocross, open track days. C4 IRS swap in progress

91 Trans Am, LB9/T5- Already lowered, with Konis, headers and exhaust on the way.

graebz28

I use a digital dakota to replace the yellow buffer box used to split the vss to the ecm, cruise and speedo.

Check out other post:

http://www.thirdgen.org/techboard/di...ml#post4031998 (new to tuning)