2.73's and 2500 stall? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ocbaud · 02-26-2004, 11:04 PM

hows this gonna run with my engine? i know low84 is running something similar in stall speed.

**crossy** · 02-26-2004, 11:17 PM

ERIC, looking at your engine specs i really don't understand why your runnning the 2.73's. I know it most likely came with them ,but are they to stay?? your definitely going to benefit from the converter because it will SOMEWHAT allow the engine to 'up' on the cam before it locks. Keep in mind that most 2.73's aren't at a high enough RPM even at highway speeds to allow the converter to fully'lock' ,so a lot of unnecessary heat & slippage will take place. DAVE

low 84 · 02-26-2004, 11:29 PM

i'm pretty sure eric is going to go with different gears when he gets a chance as am I.

well basically if you have the power to get them spinning off the line, and you will, they will spin forever. the centripetal force of the higher gears keeps them spinning once you start. you'll probly burn rubber through all 3 gears. but it won't feel as fast from a slow punch and it won't really get out of the hole quick. basically your just going to be spinning your tires like i do. if you go with like 3.73 it will be easier to get them to start spinning but they won't do it for as long. your best bet is some 3.73 and sticky tires.

i won't have any traction problems when its all said and done

ocbaud · 02-26-2004, 11:57 PM

yeah, i'm gonna wanna get 3.73's with and eaton posi. for the tires i'll be running 275/45/17 nitto 555r's

ocbaud · 02-27-2004, 12:38 AM

Quote:

Originally posted by low 84
i'm pretty sure eric is going to go with different gears when he gets a chance as am I.

well basically if you have the power to get them spinning off the line, and you will, they will spin forever. the centripetal force of the higher gears keeps them spinning once you start. you'll probly burn rubber through all 3 gears. but it won't feel as fast from a slow punch and it won't really get out of the hole quick. basically your just going to be spinning your tires like i do. if you go with like 3.73 it will be easier to get them to start spinning but they won't do it for as long. your best bet is some 3.73 and sticky tires.

i won't have any traction problems when its all said and done

oh yeah, if you dont have traction problems, you arent making enough power

**swervin ervin** · 02-27-2004, 12:46 AM

The stall is great at 2500 rpm, but the gears totally suck. With the engine you're putting in it, it will feel like a jet dragster compared to the 305. But, when you change to 3.73's the difference in off the line power will be astounding. With the 2.73 gears you have now, did your lockup work before? If it does work after you get it back together, it will be going in and out of lock all the time. It will feel a tad doggy on the bottom end with the cam and converter until you get the gears though. And as Ryan stated, it will spin the tires forever but you won't be going near as fast as it should be. 3.73's will decrease off the line traction for sure, but it will wind up quicker and the need to change gears will happen sooner, so the spinning length will decrease.

ocbaud · 02-27-2004, 12:57 AM

i dont know if the lockup worked or not before. i believe it did, but i've disconnected all the wiring that goes to it now. so it shouldnt lock up anyway

**swervin ervin** · 02-27-2004, 01:17 AM

Well, if it doesn't lock, you will be spinning the converter all the time with the 2.73 gears. At 70 mph, you will be turning aound 2300 rpm, so you are below stall all the time. This is not a good situation IMO.

ocbaud · 02-27-2004, 01:22 AM

does that mean i'll need to go faster then 70?

78chevstepside · 02-27-2004, 01:23 AM

I have the same crappy gears in my 78. Interesting I aslo have a 71 355. 4 bolt but alot more mild then this motor. I run 1.94 factory heads, 280 wolverine blue racer cam, 1406, hedmen headers. I run a 2000 stall with a shift kit turbo 350. I plan to go to a 3.55 posi gears for my rear. I think 3.73 without a overdrive will be a little rough on the freeway. For racing those gears would be great.

02-26-2004, 11:04 PM	#1
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	2.73's and 2500 stall? hows this gonna run with my engine? i know low84 is running something similar in stall speed.

02-26-2004, 11:17 PM	#2
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	ERIC, looking at your engine specs i really don't understand why your runnning the 2.73's. I know it most likely came with them ,but are they to stay?? your definitely going to benefit from the converter because it will SOMEWHAT allow the engine to 'up' on the cam before it locks. Keep in mind that most 2.73's aren't at a high enough RPM even at highway speeds to allow the converter to fully'lock' ,so a lot of unnecessary heat & slippage will take place. DAVE __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks.

02-26-2004, 11:29 PM	#3
low 84 Registered User Join Date: Jan 2002 Location: Houston, TX Posts: 2,144	i'm pretty sure eric is going to go with different gears when he gets a chance as am I. well basically if you have the power to get them spinning off the line, and you will, they will spin forever. the centripetal force of the higher gears keeps them spinning once you start. you'll probly burn rubber through all 3 gears. but it won't feel as fast from a slow punch and it won't really get out of the hole quick. basically your just going to be spinning your tires like i do. if you go with like 3.73 it will be easier to get them to start spinning but they won't do it for as long. your best bet is some 3.73 and sticky tires. i won't have any traction problems when its all said and done __________________ '51 F100, backhalf with a narrowed 9 and coil overs, 18.5" mickeys, monte front clip, +400" sbc in the works '05 1500 Crew Cab RIP '84 swb 5/7 drop, solid cammed 408 w/ fully ported dart heads, th350 w/ 10 inch hughes, 12 bolt w/ 3.73 richmonds and a locker '80 swb 4x4 in progress: 7" lift, 350 th350/np205, d44 and 1.5" ORD tie rod, 14BFF w/discs , armored diff covers, 40" MTR's

02-27-2004, 12:46 AM	#6
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	The stall is great at 2500 rpm, but the gears totally suck. With the engine you're putting in it, it will feel like a jet dragster compared to the 305. But, when you change to 3.73's the difference in off the line power will be astounding. With the 2.73 gears you have now, did your lockup work before? If it does work after you get it back together, it will be going in and out of lock all the time. It will feel a tad doggy on the bottom end with the cam and converter until you get the gears though. And as Ryan stated, it will spin the tires forever but you won't be going near as fast as it should be. 3.73's will decrease off the line traction for sure, but it will wind up quicker and the need to change gears will happen sooner, so the spinning length will decrease. __________________ Mike 1985 Chevy C-10

02-26-2004, 11:57 PM	#4
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	yeah, i'm gonna wanna get 3.73's with and eaton posi. for the tires i'll be running 275/45/17 nitto 555r's

02-27-2004, 12:57 AM	#7
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	i dont know if the lockup worked or not before. i believe it did, but i've disconnected all the wiring that goes to it now. so it shouldnt lock up anyway

02-27-2004, 01:17 AM	#8
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Well, if it doesn't lock, you will be spinning the converter all the time with the 2.73 gears. At 70 mph, you will be turning aound 2300 rpm, so you are below stall all the time. This is not a good situation IMO.

02-27-2004, 01:22 AM	#9
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	does that mean i'll need to go faster then 70?

02-27-2004, 01:23 AM	#10
78chevstepside Registered User Join Date: Nov 2002 Location: lacenter, washington Posts: 718	I have the same crappy gears in my 78. Interesting I aslo have a 71 355. 4 bolt but alot more mild then this motor. I run 1.94 factory heads, 280 wolverine blue racer cam, 1406, hedmen headers. I run a 2000 stall with a shift kit turbo 350. I plan to go to a 3.55 posi gears for my rear. I think 3.73 without a overdrive will be a little rough on the freeway. For racing those gears would be great.



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