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    Results 1 to 14 of 14
    1. #1
      Join Date
      Jan 2007
      Posts
      94

      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

    2. #2
      Join Date
      Mar 2020
      Posts
      120
      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.

    3. #3
      Join Date
      Sep 2010
      Location
      Orange County, CA
      Posts
      585
      99% will say get the close ratio



    4. #4
      Join Date
      Jun 2018
      Location
      SW Florida
      Posts
      17
      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.

    5. #5
      Join Date
      Sep 2007
      Posts
      417
      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.

    6. #6
      Join Date
      Jan 2007
      Posts
      94
      I appreciate the input guys, thanks!

    7. #7
      Join Date
      Aug 2004
      Location
      Mesa, Az
      Posts
      195
      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
      1971 Chevy C/10 Factory A/C long bed

    8. #8
      Join Date
      Sep 2016
      Location
      Bakersfield, CA
      Posts
      577
      Country Flag: United States
      I would say it depends where you live in relation to how many street lights/stops you have to deal with and if there are freeways or just highways.
      http://www.TheFOAT.com/92GTA
      1969 Pontiac Firebird
      w/535ci IAII aluminum block, Dailey dry sump, Holley EFI (full road race build). Primer black w/black interior.
      1992 Pontiac Trans Am GTA w/SLP Performance Package. Dark Jade Grey Metallic, grey leather, T-Tops.

    9. #9
      Join Date
      Jan 2007
      Posts
      94
      I'm in SoCal... while there are plenty of freeways it will mostly be stoplight to stoplight in suburbia. I want to do one Power Tour once with my pops but that won't dictate the gear ratios.
      Quote Originally Posted by anguilla1980 View Post
      I would say it depends where you live in relation to how many street lights/stops you have to deal with and if there are freeways or just highways.
      - - - Updated - - -

      How much HP/TQ are you at, and what rear gear?
      Quote Originally Posted by Reckn8 View Post
      Just took out our close ratio and put in a wide ratio. Much better for regular street driving!

    10. #10
      Join Date
      Sep 2017
      Posts
      401
      Country Flag: United States
      You just made my day that you removed a close and swapped for a wide. Since. I just dropped 4500 flee a wide
      I got an LS7 650+ hp 55/+ torque and 4.11s. Haven't driven yet but someday....
      TANKMASTERJ

    11. #11
      Join Date
      Jun 2001
      Location
      Orlando, FL
      Posts
      10,918
      Country Flag: United States
      The key to making the close-ratio work is to use a "normal" rear gear. 3.25 works very well, and gives great street manners along with enough "legs" to work on the track.
      John Parsons

      UnRivaled Rides -- Modern upgrades for your ride.

      UnRivaled Rides recent project -- LS9-powered 69 Camaro

    12. #12
      Join Date
      Jul 2008
      Location
      Summerfield, NC
      Posts
      235
      Country Flag: United States
      You can use this calculator to help decide which way to go. You can input gears, tire sizes, and trans gear ratios. At the bottom there's a cross section chart where you can see mph/gear/rpm. Helps to tell what you'd be cruising at going down the road. Also you can compare different gears/tires/trans gears, helped me to visualize my shift rpm changes when downshifting. You can print out your results and carry them with you, helps when you first switch the trans in.

      https://www.blocklayer.com/rpm-gear.aspx

      I'm a bit out of the loop on what's considered the close and wide ratios. I'm running a TUET2066 T56 out of a 05 GTO, 3.73s, and 25" tall tires.

      1st 2nd 3rd 4th 5th 6th Rev
      2.97:1 2.07:1 1.43:1 1.00:1 0.84:1 0.56:1 2.90:1

      I'm having to shift into 4th in the 1/8 mile to get over 90mph, haven't had it to the 1/4. At some point I may go with a taller tire or 3.42 gear. As of now I can use all odd or even gears. Start out in 2nd, 4th, 6th, etc. It's an all around good setup for cruising, country roads, city driving, autocross, etc.
      *Jeff*
      Project Salty - 1964 4 door Malibu, beaten, neglected, red headed foster child
      Cammed LQ4 / T56 Swap Project Thread <-click to read! 😁

    13. #13
      Join Date
      Aug 2004
      Location
      Ontario, Canada
      Posts
      2,310
      Country Flag: Canada
      I have the close ratio Magnum (2.66 1st gear) behind a torquey 400 SBC. The rear end is an 8.2 with 3.32 gears.
      It pulls well from a stop but I think the 30lb. flywheel and torque from the engine have more to do with that than the trans ratio. Around town I'm usually restricted to the first three gears, occasionally slipping into 4th in the forty zones. On the highway I usually cruise in 6th at 60 mph @ 1600 rpm. Lower than 60 I need to drop down to 5th gear. The engine and I would both be happier with 3.73s, mostly because of where the revs and speed limits match up.
      As for the gear ratio spacing I think it is perfect. With each shift the rpm drop is less with the revs landing higher in the engines torque/power curve when the load is increasing. The time between 3rd and 4th is a lot less than the time between 1st and 2nd. Ya gotta be on yer toes.

      Ken
      If there is a hard way to do something, I'll find it!
      My other car is a Vega.

    14. #14
      Join Date
      Oct 2004
      Posts
      2,438
      Country Flag: United States
      As far as trans ratios go, if you compare to autos they aren't that far apart. Honestly with the weight of the wagon, you'll be better off with the 1st gear of the wide ratio. Good drag launch and easier take off in street driving.

      Secondly, with autocross, having gears close together means a lot of shifting. Depending on the track layout can cost time. Sounds like you have the torque to utilize the midrange rpm coming off corners and winding out to the next transition. With the wide ratio, you'll probably be only using the first 5 gears at the most around town, and only use the 6th for highway.
      Red Forman: "The Mustang's front end is problematic; get yourself a Firebird."