Can some one confirm this Part number?

Elombard · 05-29-2005, 06:32 PM

The number is for a mag case tranny.

91530110120R (I am pretty sure on the last few numbers??)

I want to confirm it is a 7:31 tranny.

Thanks

Grady Clay · 05-29-2005, 07:35 PM

EW,

That is a casting number not a part number. The numbers you need to post are stamped under the transmission. The sequential serial number is possibly in the form; 7135xxxx. There is also a type number in the form; 915/xxx. Please post these numbers and we can get you information.

Good for asking.

Best,
Grady

Elombard · 05-30-2005, 05:37 AM

Thanks Grady, I will get that. This tranny is actually in your neighborhood out there. Small world.

jacko241 · 05-30-2005, 05:49 AM

Grady, would that number also tell individual ratios, final drive, etc.?

SleeperZ · 07:13 AM

The casting number is 9153011020R, and the model is 915/06. Serial number 7343928.

I shift the unit into the gear opposite reverse, and for one rotation of both the output flanges, I get just over 3 rotations of the input shaft. Similar for the middle shift position pushed in (I don't have a shifter or remember the shift pattern). At first test, it looks like a 8:31 ring and pinion... Anyone have a better test?

Elombard · 05-30-2005, 08:38 AM

I think that is 5th gear? 4th would be next to reverse. I think a 7:31 and 8:31 would be really close in a test like that. I think it equates to 8 turns of the out put for every 31 turns of the input so it would be a pretty small difference with just 4 or 5 turns. Maybe I am wrong. Seems like a bif diff. when you drive them??

Grady Clay · 05-30-2005, 09:23 AM

7343928

7 = Transmission for 6-cyl. Engine
3 = 5-speed 915/06
4 = 1974 Model Year
3928 = Consecutive transmission number

915/06 5-speed

1st Gear = 11:35
2nd Gear = 18:33
3rd Gear = 23:29
4th Gear = 27:25
5th Gear = 29:21
R&P = 7:31

Best,
Grady

Elombard · 05-30-2005, 09:52 AM

Thanks Grady

I believe the very desirable 74' gear box. Probably out of my reach.

Grady Clay · 05-30-2005, 12:43 PM

Do you want me to go look at it for you?

Best,
Grady
gradyclay@hotmail.com

SleeperZ · 05-30-2005, 03:26 PM

Quote:

Originally posted by Grady Clay
7343928

7 = Transmission for 6-cyl. Engine
3 = 5-speed 915/06
4 = 1974 Model Year
3928 = Consecutive transmission number

915/06 5-speed

1st Gear = 11:35
2nd Gear = 18:33
3rd Gear = 23:29
4th Gear = 27:25
5th Gear = 29:21
R&P = 7:31

Best,
Grady

Thank you very much. I'd be happy to show the transmission by appointment. PM me or email me at sleeper78z*no-spam*@yahoo.com (remove the *no-spam*).

Elombard · 05-30-2005, 03:48 PM

Thats OK Grady. Thanks for the offer. Its on Ebay and will probably bid higher than I can swing right now. I dont think you are that close to Denver anyway.

jacko241 · 05-31-2005, 04:37 PM

Grady, my transmission number is 915/61 7173828, would you please decipher it for me?

Early_S_Man · 05-31-2005, 11:16 PM

Jacko,

1977 915/61 with 8:31 r&p ... 3.875:1

1st - AZ : 11:35 == 3.181
2nd - HX : 18:33 == 1.833
3rd - NT : 23:29 == 1.261
4th - QQ : 26:26 == 1.000
5th - SN : 28:23 == 0.821

jacko241 · 03:55 AM

Thanks, Warren! I appreciate that. The guy I bought this trans from told me it was a 7:31 r&p, so if it is, it was replaced. Where do you guys get that information?