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04-18-2021 #1Registered User
- Join Date
- Jan 2007
- Posts
- 93
Advice on close or wide ratio T56
63' Belair Wagon, 481" W motor, might be around 550HP/550TQ, 9" rear with 3.89's and about a 28" tall tire. Might see one auto cross event and one trip to the drags per year... mostly going to be for getting groceries and carting the kids around school/practice. The engine will be mostly done by 6000 rpm. Kinda leaning towards the wide ratio as the 1st gear will be fun, and I have enough torque to pull it in the other gears that I don't need to keep the R's way up. For those with a wide ratio - are you pretty happy with the ratio spread or do you find yourselves wishing it was a bit closer? And for those with the close ratio - are you constantly shifting? I don't want something that requires me shifting 3 times before I get to the end of an intersection.
Thanks in advance,
Eric
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04-18-2021 #2Registered User
- Join Date
- Mar 2020
- Posts
- 200
I have a close ratio with a 27.5" tire & 4.10's.
First gear is pretty short, even shifting it at 6500.
Unless I was under powered or very heavy, I do not think I would like a wide ratio trans with more than a 3.73 gear.
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04-18-2021 #3
99% will say get the close ratio
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04-19-2021 #4Registered User
- Join Date
- Jun 2018
- Location
- SW Florida
- Posts
- 33
I agonized over this choice as well. My car is roughly 3600+ pounds with a 3.31 rear and 27" tall tires. With the close ratio T56 that gives me roughly the same gear multiplication is first gear as the original 2.20 Muncie and a 4.11 rear. I only have a SBC, so dont have the torque you have. The other consideration is the upper gears. My 5th is a perfect around town OD gear, with 6th only useful above 65 MPH, but again, a lot of that is due to the engine size and cam range. It is less than happy below ~1400 rpm when you roll on the throttle in 6th. I think with your extra gear and torque the close ratio will work great. You might find with your rear ratio the wide ratio first gear is too low, almost like a granny gear.
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04-19-2021 #5Registered User
- Join Date
- Sep 2007
- Posts
- 424
I abandoned ideas of a Tremec 6spd because they don't make a wide ratio (for the lower 4 gears) with normal spacing.
The "close ratio" gives you all four gears spaced tightly.
The "wide ratio" gives you the first 3 gears spaced tightly, and then a wide gap from 3rd-to-4th.
If you don't want the first few gears to be spaced tightly . . . you're out of luck. No amount of messing with axle gears will fix that.
Tremec's 5spds don't have this problem at all. Both of their ratios (1st-to-4th) are spaced normally.
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04-19-2021 #6Registered User
- Join Date
- Jan 2007
- Posts
- 93
I appreciate the input guys, thanks!
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04-20-2021 #7
Just took out our close ratio and put in a wide ratio. Much better for regular street driving!
-Paul
1969 Camaro "Reckn8"- LS7/C4 Front and Rear
1965 Oldsmobile F/85 LS6 W/Maggie, 6-speed,Ride Tech, Baer brakes
1978 Blazer 2 wheel drive with LS power
1965 VW bug. All original
1968 GMC short box
1964 Buick Riviera
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04-20-2021 #8