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Low FIRST Gear 904 transmission #800559 09/13/10 09:28 PM 09/13/10 09:28 PM
Joined: Aug 2009 Posts: 151 Northern Virginia B barracuda7 OP member
barracuda7 OP member B Joined: Aug 2009 Posts: 151 Northern Virginia	I want a Low 1st Gear for my 904. I did a lot research and it seem to come "if I want Low 1st Gear, I will have Low 2nd Gear". Like the 904 Ratio is: 2.45/1.45/1 if I change/swap to Low 1st Gear, it will be: 2.74/1.54/1 , no other option. But I want 2.74/1.45/1 After study the 904 by myself, I release that if I want Low 1st Gear, I will need new REAR ring gear & smaller Sun Gear(other side Sun Gear stay the same 28 teeth)and possibility new Low-Reserve Drum. Anyone make a Gear Set to lower 1st gear ratio only? Or anyone have modify the 904 that way, can you please let me know how did you do? Thank in advance Last edited by barracuda7; 09/13/10 10:04 PM.

Re: Low FIRST Gear 904 transmission [Re: barracuda7] #800560 09/13/10 10:33 PM 09/13/10 10:33 PM
Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada W Wedgeman pro stock
Wedgeman pro stock W Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada	Another option would be to pick up an A999 trans with 5 disc clutch and stronger internals... Dan

Re: Low FIRST Gear 904 transmission [Re: barracuda7] #800561 09/13/10 10:47 PM 09/13/10 10:47 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	. I want to eliminate 1st and 2nd (to save a few lbs) & start in 3rd (6:20 rear gears) for next years circle burner (904). live every 24 hour block of time like it's your last day on earth

Re: Low FIRST Gear 904 transmission [Re: Wedgeman] #800562 09/14/10 03:19 PM 09/14/10 03:19 PM
Joined: Aug 2009 Posts: 151 Northern Virginia B barracuda7 OP member
barracuda7 OP member B Joined: Aug 2009 Posts: 151 Northern Virginia	Quote: Another option would be to pick up an A999 trans with 5 disc clutch and stronger internals... Dan This swap will completely changed ratio at BOTH 1st Shift and 2nd Shift. I need lower ratio at 1st Shift only, this ever done before?

Re: Low FIRST Gear 904 transmission [Re: barracuda7] #800563 09/14/10 03:59 PM 09/14/10 03:59 PM
Joined: Sep 2003 Posts: 1,465 Carson City, NV B babarracuda pro stock
babarracuda pro stock B Joined: Sep 2003 Posts: 1,465 Carson City, NV	I don't think it is possible. Call Pro Trans in Lancaster CA. He does all sorts of changes to 727's and 904's. In racing the complaint is that when you put in the low gears the jump from second ti third is too much. Some say that on a under 500 HP car you lose too much with the bigger ratio drop. I raced a 360 and two of my friends raced 340's with the low gear and never had a complaint. I guess that I don't understand why you want the 1.45 second gear?

Re: Low FIRST Gear 904 transmission [Re: babarracuda] #800564 09/14/10 10:49 PM 09/14/10 10:49 PM
Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada W Wedgeman pro stock
Wedgeman pro stock W Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada	Why would you want to go slower after a faster launch ? Dan

Re: Low FIRST Gear 904 transmission [Re: Wedgeman] #800565 09/15/10 12:28 AM 09/15/10 12:28 AM
Joined: Aug 2009 Posts: 151 Northern Virginia B barracuda7 OP member
barracuda7 OP member B Joined: Aug 2009 Posts: 151 Northern Virginia	Quote: Why would you want to go slower after a faster launch ? Dan I dont want go slower after a fast launch. In my opinion, after launch hard at 1st Shift, the car already had the momentum, so the higher 2nd Gear ratio(1:45)will force car move more faster (compare to lower 2nd Gear ratio(1:54)) Otherwise(when the car has momentum)lower 2nd Gear ratio(1.54) will hold the engine revving at high RPM but not really good for acceleration.

Re: Low FIRST Gear 904 transmission [Re: barracuda7] #800566 09/15/10 09:10 PM 09/15/10 09:10 PM
Joined: Nov 2006 Posts: 1,459 oklahoma F forphorty pro stock
forphorty pro stock F Joined: Nov 2006 Posts: 1,459 oklahoma	they use the 1.54 with the 2.74 low so the rpm won't drop so much on the 1-2 shift. The rpm drop on the 2-3 shift will be slightly greater with the 1.54, compared to the 1.45. It's all a compromise.Just run the 2.74, 1.54 gearset and don't worry about it.

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