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#1
06-15-2007, 03:11 PM
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ID transmission
I am trying to ID the transmission that came out of my 1966 GTO. Previous owner said it was a 4 speed. None of the numbers or letters match up to any GTO codes. It does say GM on the case, and 1 inch yellow paint letters ZH can be seen. I cant find that code anywhere--anyone know what ZH is?
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#2
06-15-2007, 03:33 PM
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If it is an aluminum case there are generally numbers stamped on the main case or tailshaft on one of the flat seams.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#3
06-15-2007, 04:02 PM
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I found all kinds of numbers: GM 21 3862845 9/7 3925647 50 GM 74 . I think I have at least determined that it is a Saginaw, but not sure. Do any of these numbers make sense?
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#4
06-15-2007, 06:07 PM
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look at the case cover, can be id as to maker there. Run google search for cover ids.
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#5
06-15-2007, 09:17 PM
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I don't think it's a 4 speed?
 The 3862845 is the number for a 1973-75 3-speed Saginaw tranny. With the 74 on the tranny probably a 1974 tranny? Does it have just 2 posts for the shifter levers? If 3 is the rear one on the side cover?
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#6
06-17-2007, 07:47 AM
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Thanks for the reply. The tranny has 2 posts on tne side cover and none on the rear extension. Of the two that are on the side cover, the rearmost lever has 2 holes, one at the top of the lever and one at the bottom----I assume that 2 shifter rods fit into that lever. That would make a total of three shift rods which makes me think it is a 4 speed. Strangely, only 2 rods are present though, one rod on the front lever and one rod on the rear lever. Any thoughts? I am trying to decide whether to invest $ in this tranny, or purchase a muncie or dearborn.
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#7
06-17-2007, 04:08 PM
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With only two posts it is a three speed. that third hole most likely went to the steering column for the lockout feature
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#8
06-17-2007, 06:24 PM
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I agree with crider.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#9
06-17-2007, 06:45 PM
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Thanks again for the help. Could the third hole have something to do with the backup light switch? I believe it is on the same lever as first gear. Cant find any other place for the backup switch.
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#10
06-17-2007, 07:17 PM
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You'd be surprised how much info some of the guys in tech dept have at YEAR ONE.
http://www.yearone.com/serverfiles/f...ain2.asp?cat=5 give em a call. |
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#11
06-17-2007, 07:53 PM
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Anyway, anyone familiar with this three speed saginaw?
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#12
06-17-2007, 08:46 PM
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Definitely want to rid yourself of the Saginaw 3 speed. The 4 speed Muncie or T-10 is the way to go. What part of SC are you in?
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If it ain't broke, fix it 'till it is |
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#13
06-18-2007, 08:23 PM
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Charleston. Just hate to spend big bucks for a muncie.
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#14
06-18-2007, 09:31 PM
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If it is a 1974 Saginaw, the reverse light switch would have been on the
bottom of the column under the dash. The 1st/reverse lever would have the reverse lockout rod hooked to the column. It would have controlled the reverse switch too. The Saginaw is not a hi-performance tranny. May work OK if not much abuse put to it.
__________________
John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#15
06-18-2007, 09:45 PM
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Check the "Performance Parts for Sale/Wanted" area. There is an ad w/link to an Ebay auction for a 78-79 Super T-10. 5 days left and only up to $100. If I run across anything decent, I'll let ya know.
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If it ain't broke, fix it 'till it is |
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#16
06-19-2007, 06:57 PM
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OK, from what i am hearing from you guys, the saginaw isnt the way to go. Got a quote for a new muncie 4 speed for a whopping $1,675 plus shipping---ouch!!!!!This is a brand new (not rebuilt) tranny that is a direct replacement for the original muncie. Does this sound normal or too high? Also, what exactly is the T-10? Thanks again!
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#17
06-19-2007, 07:40 PM
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DLDGTO,
Here is a run down of the parts I used to build my M-20 for my 1975 Formula. Tranny will be going behind a 412 eventually. This should give you an idea of what the parts cost when looking at a rebuilt or used gearbox: Used 1968 Dual-Plug 1" Countershaft Case Zyglo Inspected : $125.00 Steel Midplate: $ 65.00 28 Spline Passenger Side Speedo Tail Housing: $ 35.00 (From buddy Tim Beebe's Tranny Shop) New 1-2/3-4 Synchro Assemblies: $165.00 New 2.52:1 10 Spline Gearset: $425.00 New Reverse Gearset Complete With Idlers/Shafts: $125.00 New Front Bearing Retainer: $ 35.00 Fully Sealed N307 Front Bearing: $ 45.00 Gasket/Seal Kit: $ 24.00 Hard Parts Kit with All Bearings/Needles: Thrusts/Small Parts: $ 75.00 New Shift Forks: $ 40.00 New 8 Tooth Speedo Drive Gear Steel: $ 30.00 New Steel Speedo Bullet w/Seals: $ 25.00 New 19 Tooth Driven Gear: $ 14.00 That took care of the basic gearbox, with me doing all the assembly, but on top of that I had to purchase a shifter and linkage new (about $300.00) all the pedals, linkage, backdrive, bellcrank, bell housing, new steel Hays 30# Flywheel, Console and floor hump. By my estimates, I have a total of $800.00 invested in these items. I hope this information is helpful...Robert |
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