PG gear ratio?

L79racer · 12-12-2009, 10:20 AM

Looking for some input for first gear ratio. What would you recommend for my car. 2850lbs 383 small block, 29" tire with 4.56 gears. Shifting at 7200 running through the traps at 7000. Cars been 10.20's at 130 foot braking it with 4000 stall glide and a 1.94 gear set. 4 link car. Just loosen the converter to 4800. 8" ATI converter. Smaller, bigger looking for opinions from experience. I'm new to automatics and the gear set broke so I need another one. Thanks, Vinny

Monte Howard · 12-12-2009, 10:27 AM

1.94 or 1.98 should be fine for that combo,loosening the converter will help ALOT 4000 was to tight.

L79racer · 12-12-2009, 11:05 AM

Quote:

Originally Posted by Monte Howard

1.94 or 1.98 should be fine for that combo,loosening the converter will help ALOT 4000 was to tight.

Is there a big e.t. difference from 1.80 to 1.94 or is it minimal? At 130 mph should this go into the 9.90 range? Same combo with a stick was going 133 mph.

283SS · 12-12-2009, 12:38 PM

with a 383 and that light of a car just put the stock 1.76 gear set in the car and race if u do try to run the stock 1.82 u will have to pull in out after about 100 runs any more runs chanse of braking it

L79racer · 12-12-2009, 01:23 PM

Quote:

Originally Posted by 283SS

with a 383 and that light of a car just put the stock 1.76 gear set in the car and race if u do try to run the stock 1.82 u will have to pull in out after about 100 runs any more runs chanse of braking it

I'm going to trans brake it and I dont think the stock 1.76 gear will last plus I want to break into the 9's and I think it will need more than the 1.76 gear.

283SS · 12-12-2009, 01:39 PM

ow yes 1.76 will last even longer sens u running a small block 383 how much motor u got? I ran 1.76 with 406 for yrs low 10s and never broke in 3300 pound car tried 1.96 gear set and car did not like it to much first gear for the power

L79racer · 12-12-2009, 01:53 PM

Quote:

Originally Posted by 283SS

ow yes 1.76 will last even longer sens u running a small block 383 how much motor u got? I ran 1.76 with 406 for yrs low 10s and never broke in 3300 pound car tried 1.96 gear set and car did not like it to much first gear for the power

maybe 550 to 580 hp. Its just a pump gas motor street car. When you switched to the 1.96 what did you loose in 60' and et? What rear gear and tire were you running? I really want to get this thing into the 9's

283SS · 12-12-2009, 02:26 PM

lost on 60 and et cant remember how much been so long my car head 4.56 gears and 32-14.5w stiff side wall lunch at 5500 on brake shift at 6500 and 6800 at finsh line

L79racer · 12-13-2009, 10:01 AM

Anybody else want to add what gear they run and et?

Darrin Christen · 12-14-2009, 09:46 AM

I ran a 355" sbc in a 2860# chevy II with a 1.76 glide 5.67 rear gear. Car went a best of 1.33 60' @ 9.86 and consistent 9.90's @132mph at 8200 rpm in cool weather. I put a 2.03 low gear and 5.43 rear gear. 60' times dropped to 1.30-1.29 and ran basically the same E.T. and mph at 7900 rpm. You will have more rpm drop at gear change with the lower gear ratio. Car has a 8" 5800 convertor and a 15" x 33" 105" roll out. I leave with the trans brake at 4200 rpm. The car was more consistent with the 2.03 low gear due to being able to transfer the weight better, and a whole lot more fun to drive! The 2.03 broke after about 350 runs. I put the good old reliable 1.76 back in for now! Hope this helps.

12-12-2009, 10:20 AM	#1
L79racer Member Join Date: Jan 2005 Location: North Massapequa, NY Posts: 218 Likes: 0 Liked 0 Times in 0 Posts	PG gear ratio? Looking for some input for first gear ratio. What would you recommend for my car. 2850lbs 383 small block, 29" tire with 4.56 gears. Shifting at 7200 running through the traps at 7000. Cars been 10.20's at 130 foot braking it with 4000 stall glide and a 1.94 gear set. 4 link car. Just loosen the converter to 4800. 8" ATI converter. Smaller, bigger looking for opinions from experience. I'm new to automatics and the gear set broke so I need another one. Thanks, Vinny

12-12-2009, 10:27 AM	#2
Monte Howard Member Join Date: Nov 2002 Location: Potomac,IL Posts: 269 Likes: 1 Liked 49 Times in 15 Posts	Re: PG gear ratio? 1.94 or 1.98 should be fine for that combo,loosening the converter will help ALOT 4000 was to tight. __________________ Monte Howard 3209 STK, 3208 SS

12-12-2009, 12:38 PM	#4
283SS Junior Member Join Date: Dec 2007 Posts: 35 Likes: 0 Liked 0 Times in 0 Posts	Re: PG gear ratio? with a 383 and that light of a car just put the stock 1.76 gear set in the car and race if u do try to run the stock 1.82 u will have to pull in out after about 100 runs any more runs chanse of braking it

12-12-2009, 01:39 PM	#6
283SS Junior Member Join Date: Dec 2007 Posts: 35 Likes: 0 Liked 0 Times in 0 Posts	Re: PG gear ratio? ow yes 1.76 will last even longer sens u running a small block 383 how much motor u got? I ran 1.76 with 406 for yrs low 10s and never broke in 3300 pound car tried 1.96 gear set and car did not like it to much first gear for the power

12-12-2009, 02:26 PM	#8
283SS Junior Member Join Date: Dec 2007 Posts: 35 Likes: 0 Liked 0 Times in 0 Posts	Re: PG gear ratio? lost on 60 and et cant remember how much been so long my car head 4.56 gears and 32-14.5w stiff side wall lunch at 5500 on brake shift at 6500 and 6800 at finsh line

12-13-2009, 10:01 AM	#9
L79racer Member Join Date: Jan 2005 Location: North Massapequa, NY Posts: 218 Likes: 0 Liked 0 Times in 0 Posts	Re: PG gear ratio? Anybody else want to add what gear they run and et?

12-14-2009, 09:46 AM	#10
Darrin Christen Member Join Date: Mar 2007 Location: Des Allemands, LA Posts: 365 Likes: 8 Liked 1 Time in 1 Post	Re: PG gear ratio? I ran a 355" sbc in a 2860# chevy II with a 1.76 glide 5.67 rear gear. Car went a best of 1.33 60' @ 9.86 and consistent 9.90's @132mph at 8200 rpm in cool weather. I put a 2.03 low gear and 5.43 rear gear. 60' times dropped to 1.30-1.29 and ran basically the same E.T. and mph at 7900 rpm. You will have more rpm drop at gear change with the lower gear ratio. Car has a 8" 5800 convertor and a 15" x 33" 105" roll out. I leave with the trans brake at 4200 rpm. The car was more consistent with the 2.03 low gear due to being able to transfer the weight better, and a whole lot more fun to drive! The 2.03 broke after about 350 runs. I put the good old reliable 1.76 back in for now! Hope this helps. __________________ 4878 SS/GA 66CHEVY II