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| THM125C automatic transmission coding? What final drive ratio does it have? (Page 1/2) |
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cebix
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JUL 30, 11:28 AM
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I'm looking to buy a used automatic transaxle and someone claims he has one with codes 6CPC and TGST on it.
I don't see any of these codes on this site: http://www.calgaryfieros.com/OSGdocs/tranny.html
Can you tell by these codes what's the final drive ratio? Is it really from a Fiero? Thanks.[This message has been edited by cebix (edited 07-30-2019).]
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olejoedad
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JUL 30, 08:26 PM
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The code 6CPC does not appear in the NIFE Enthusiasts Guide.
The code 7CPC appears as the trans for the 87 V-6 cars.
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cebix
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JUL 31, 02:56 AM
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Do you think it's possible that this number just wasn't catalogued yet or can this transmission not be from a Fiero?
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olejoedad
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JUL 31, 07:34 AM
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I don't have info to answer that with accuracy.
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Dennis LaGrua
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JUL 31, 11:48 AM
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To check the FD ratio pull the speedometer sensor and look at the color of the gear. For instance a blue gear will be on a 3:33:1 FDR transmission, a white gear would probably be 3.18 but I've got to find the chart to give you exact numbers. ------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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theogre
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JUL 31, 01:37 PM
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Fiero trans gears listed in my Cave, Gear Ratio
Other GM vehicles often have different gearing.
------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave
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cebix
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JUL 31, 02:10 PM
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Thanks guys. I'm acting only locally with this since the shipping cost is just too much. So I'll be throwing some ideas - glad if anybody could help.
There's a TH125C near me for sale from a 1990 Grand Am 2.5. Are these a direct swap? Only readable number is 90 PNC 156364.
Thank you.[This message has been edited by cebix (edited 07-31-2019).]
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theogre
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JUL 31, 04:36 PM
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Should be same but may have a different plug etc for TCC or VSS.
Example: If new unit has Optical VSS then you have to charge most of governor to fit Fiero VSS.
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cebix
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JUL 31, 05:08 PM
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Thanks. I have some photos of said transaxle. Does it look like an optical sensor? Can you tell just by the photo should it fit the '85 2.5 Fiero?
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cebix
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AUG 03, 05:20 AM
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Bought it. Will see if it fits and works soon. Will post if it needs any modifications for future reference.
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