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#92438 - 08/31/17 05:34 PM Re: Chevy 250 hp confusion [Re: intergrated j 78]
Lifeguard Offline
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Registered: 02/17/14
Posts: 433
Loc: Rockford, IL
Originally Posted By: intergrated j 78
If 3.08 is the kiss of death, then the TH 350- 2.73 gears that I have are the Zombie Appolicapse!!! According to The "Gonlicuator" switching to a 2.74 first gear TH 200 won't help much at the drag strip. Jay


Glad you finally made it to the conversation....we got another Nova here. wink

Yeah, I keep quoting the "kiss of death" 3.08, but he was just in reference to early Chevy IIs with a Powerglide in comparison to the 3.55 it had initially. I don't think that applies to the TH350 because of the deeper first gear. The question at hand is that TonyPA has a 3.08 Posi on his Nova and is wondering what he should upgrade it to.

For me, my 2.73 is the performance ratio for 3.50 1st Sag, while the 3.08 would be the high perf upgrade.

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#92439 - 09/01/17 06:18 AM Re: Chevy 250 hp confusion [Re: TonyPa]
panic Offline
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Registered: 01/11/05
Posts: 1496
Loc: Hempstead, Long Island, NY
Combination used in many Toyota L6 cars 1990-2000.
1st 2.804:1
2nd 1.531:1
3rd 1.000:1
High .705:1 (overdrive)
Axle 3.769:1
1st X axle = 10.568:1
Overall ratio in high gear = 2.657:1
30 mph per 1,000 RPM (26.6" tire)

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#92440 - 09/01/17 09:47 AM Re: Chevy 250 hp confusion [Re: panic]
Lifeguard Offline
Active BB Member

Registered: 02/17/14
Posts: 433
Loc: Rockford, IL
Originally Posted By: panic
Combination used in many Toyota L6 cars 1990-2000.
1st 2.804:1
2nd 1.531:1
3rd 1.000:1
High .705:1 (overdrive)
Axle 3.769:1
1st X axle = 10.568:1
Overall ratio in high gear = 2.657:1
30 mph per 1,000 RPM (26.6" tire)


Toyota L6? Auto?

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#92441 - 09/01/17 11:48 AM Re: Chevy 250 hp confusion [Re: TonyPa]
panic Offline
Active BB Member
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Registered: 01/11/05
Posts: 1496
Loc: Hempstead, Long Island, NY
Yes, A340E

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#92442 - 09/02/17 07:38 PM Re: Chevy 250 hp confusion [Re: panic]
stock49 Offline

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Registered: 04/09/03
Posts: 999
Loc: Medina, Ohio USA
My S54 equipped I4 MR2 has the following
Gear Ratios:
5th: 0.820
4th: 1.028
3rd: 1.322
2nd: 1.960
1st: 3.285
Final Drive Ratio: 4.176
Yielding a Crawl Ratio = 1st x Final of 13.718

To panic's point the 10x CR is a floor. My NA '92 MR2 left the factory with a 135hp . . . and the Toyota engineers chose a CR approaching 14 . . . in a stick shift.

regards,
stock92

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#92443 - 09/02/17 09:43 PM Re: Chevy 250 hp confusion [Re: TonyPa]
TheSilverBuick Offline
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Registered: 12/22/10
Posts: 460
Loc: Ely, NV
My favorite gear to date is the 4.56 gear with a 27" tire and an overdrive. Car feels like a rocketship (though technically still slow) and did well with the overdrive. Even drove to Salt Lake City at 80mph on I-80 at 3200rpm for a hundred miles each way.

Currently have 3.42's and they are pretty decent, but have another set of 4.56's ready to go back in.

My car has a 200-4r in it for an overdrive.

Interestingly enough, a bunch of my friends that run single digits in the 1/4 have been switching to a powerglide with gear vendors on the back and gearing appropriately for the gear vendors to shift going down the track.
_________________________
Rebuilding an OHC Pontiac 250 with EFI and a Turbo

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