Jims56chevy
Frequent Contributor
Posts: 2442
Age: 70
Loc: chino valley az
Reg: 11-23-04
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10-31-14 03:58 PM - Post#2495107
Yes i'm looking for info, i'm about to put a 700r4 trans in my 56, right now it has the digital speedo setup, and i'm going to change ir over to the mech setup.Is there anyone here using the 700r4 with 3:73 and 29" tires/I'm trying find out what speedo gear setup i need.
thank you and have a good day.
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 acardon
Ultra Senior Member
Posts: 11504
Loc: DFW TEXAS
Reg: 03-25-05
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10-31-14 04:56 PM - Post#2495121
In response to Jims56chevy
A 17 red drive gear with a 44 dark gray driven would be the closest combination. http://www.tciauto.com/tc/speedometer-gear-c alcula...
Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)
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Jims56chevy
Frequent Contributor
Posts: 2442
Age: 70
Loc: chino valley az
Reg: 11-23-04
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11-01-14 10:36 AM - Post#2495244
In response to acardon
Thanks Bud.Bowties has calculator,that comes up with 19 and 34.So which one correct?
http://700r4.com/speedoCalc/speedocalc .shtml
Edited by Jims56chevy on 11-01-14 10:38 AM. Reason for edit: No reason given.
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raycow
DECEASED
Posts: 27999
Loc: San Francisco, CA
Reg: 11-26-02
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11-04-14 04:41 PM - Post#2496210
In response to Jims56chevy
29" tires and 3.73 gears is 2594 revs/mile, so 44:17 HAS to be the right pair. Whoever came up with that 34:19 combo needs to start looking for some better stuff to smoke. If Bowtie's transmissions are as bad their calculators, they are going to be having some serious problems. 
Ray
| Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive. |
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models916
Valued Contributor
Posts: 4785
Age: 73
Loc: Addison, IL
Reg: 05-28-10
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11-06-14 06:46 AM - Post#2496592
In response to raycow
39 driven and 15 on the output shaft will be right on the money. Small holder housing.
http://www.ebay.com/itm/TCI-Auto-880018-S peedomete...
http://www.ebay.com/itm/39-tooth-700r4-TH 350-TH400...
http://www.ebay.com/itm/39-tooth-700r4-TH 350-GM-Sp...
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raycow
DECEASED
Posts: 27999
Loc: San Francisco, CA
Reg: 11-26-02
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11-07-14 02:24 AM - Post#2496817
In response to models916
39:15 would be good too. That's 2600 revs/mi (44:17 is 2588).
Ray
| Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive. |
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models916
Valued Contributor
Posts: 4785
Age: 73
Loc: Addison, IL
Reg: 05-28-10
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11-10-14 10:27 AM - Post#2497524
In response to raycow
The 44 requires the expensive gear holder for the tailshaft.
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raycow
DECEASED
Posts: 27999
Loc: San Francisco, CA
Reg: 11-26-02
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11-10-14 11:55 AM - Post#2497543
In response to models916
I didn't realize that the 40-45 tooth gear sleeve costs more than the 34-39. If you have to buy a sleeve in addition to the gears, it certainly makes sense to go with the cheaper one.
Ray
| Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive. |
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Algoma56
Contributor
Posts: 764
Loc: Sault Ste. Marie, ON, Can...
Reg: 03-14-05
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11-12-14 10:48 AM - Post#2498052
In response to raycow
Yes the sleeve costs more. Mine broke at the re-builders, and we were trying to find one in town used, or swap, or whatever. Hard to find, and to buy one is more expensive. Still looking to find a cheap one, hopefully one of my buddies comes up with a barter deal.
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models916
Valued Contributor
Posts: 4785
Age: 73
Loc: Addison, IL
Reg: 05-28-10
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11-13-14 06:59 AM - Post#2498284
In response to Algoma56
Small gear version in plastic
http://www.ebay.com/itm/700R4-350-BOP-PLA STIC-SPEE...
Big gear used
http://www.ebay.com/itm/GM-700R4-TH350-Sp eedometer...
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