Your donations help keep this valuable resource free and growing. Thank you.
|
Standard rear differential gear ratio question |
Post Reply | Page 123> |
Author | |
Rambler Mexicano
AMC Addicted Joined: Mar/05/2011 Location: Guadalajara Status: Offline Points: 976 |
Post Options
Thanks(0)
Posted: Apr/10/2011 at 5:16pm |
Hi,
I have some questions regarding the AMX, Javelin, Rebel and the Matador. What is the STANDARD gear ratio for the rear differential in all these lines? I know that within Group 19 parts you had the option of five different gear ratios: 3.73:1, 3.91:1, 4.10:1, 4.44:1, 5.00:1, at least in the 1968-1974 Javelins and AMXs, I don't know if they were available in the Rebel Machine, Hornet SC/360 or any other line. Is the standard ratio the same for all units regardless if they are six cylinder cars or V8 cars? If not, what's the standard ratio for the sixes and what's the standard ratio for the V8s? What ratios were available as optional equipment (excluding the Group 19 ones) in these four lines? Thanks in advance. |
|
Mauricio Jordán
Cuando no se es una empresa famosa se deben hacer mejores automóviles. - Vehículos Automotores Mexicanos S. A. de C. V. |
|
poormansMACHINE
AMC Addicted Charter Member Joined: Jun/28/2007 Location: Shoemaker-Levy9 Status: Offline Points: 12302 |
Post Options
Thanks(0)
|
2.87 with a factory option 3.15 was usually the common with V-8 car.
|
|
Rambler Mexicano
AMC Addicted Joined: Mar/05/2011 Location: Guadalajara Status: Offline Points: 976 |
Post Options
Thanks(0)
|
Thanks Ron,
I just found this. http://www.amx-perience.com/1971JavAMX.htm Specs for the 1971 Javelin AMX, It came standard with the 2.87:1 gear ratio with the 360 cubic inch V8 regardless of carburetor and exhausts, and had the 3.15:1 and the 3.54:1 gear ratios as optional equipment. Also, the same car with the 401 V8 already had the 3.15:1 as standard equipment even though the 2.87:1 was still available as optional equipment as was the 3.54:1 gear ratio. Thanks again. |
|
Mauricio Jordán
Cuando no se es una empresa famosa se deben hacer mejores automóviles. - Vehículos Automotores Mexicanos S. A. de C. V. |
|
ramblinrev
Moderator Group Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11539 |
Post Options
Thanks(0)
|
Often there was a difference between a manual transmission car and an automatic equipped car. '70 AMX with Go-Package, for example: 3.15 with automatic, 3.54 with 4-speed.
|
|
74 Hornet Hatchback X twins (since 1977)
62 American Convertible (still worth the $50 I spent in 1973!) AMCRC #513, AMO #384 70 AMX 360 4-speed (since 1981) |
|
billd
Moderator Group Forum Administrator Joined: Jun/27/2007 Location: Iowa Status: Offline Points: 30894 |
Post Options
Thanks(0)
|
Yes - my 70 (390 auto) is stamped with the code for 2.87 yet the gears are actually 3.15 The invoice that the original owner got said "gear ratio" on it, and it cost about 10 bucks. |
|
Rambler Mexicano
AMC Addicted Joined: Mar/05/2011 Location: Guadalajara Status: Offline Points: 976 |
Post Options
Thanks(0)
|
Thanks Rev, I actually saw that now also engine and transmission combination are vital to the gear ratio but also the shift control configuration. The 401 1971 AMX with automatic transmission on the column has a gear ratio of 3.15:1 while the same car with the same engine and transmission with floor shift has the 2.87:1 ratio. I'll keep on investigating. |
|
Mauricio Jordán
Cuando no se es una empresa famosa se deben hacer mejores automóviles. - Vehículos Automotores Mexicanos S. A. de C. V. |
|
farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19676 |
Post Options
Thanks(0)
|
Six cylinder cars most often used 3.08 gears in the Javelin, 3.15 in the bigger cars -- auto and manual trannys (from the 71 TSM). The Hornet and Gremlin used a bit taller gearing -- 2.73 was most common. Hornets with manual used a 3.08, Gremlins 2.73 with auto or manual. Without AC both used a 2.37 with auto trans.
Note that Mexican built cars (VAM cars) most likely have a bit lower gearing due to the high elevation in the vicinity of Mexico City. |
|
Frank Swygert
|
|
70bigbadorange
AMC Fan Joined: Nov/30/2012 Location: AZ Status: Offline Points: 4 |
Post Options
Thanks(0)
|
guys, thanks for all the info on diffs. I have a 70 Javelin. don't know about stamps or stickers but I'm putting in a lock right so I got mine apart enough to count the ring gear and pinion teeth and I got a 3.15. wish I had the 3.54 but I guess this will do for now.
Mine also came with the 904 3 speed auto trans (i believe)... years ago I put the 727 in it. now I would like to upgrade to a 4spd auto. does anyone have advise for me on that???????? does anyone know the best way to go if I want to put a 4sp auto in it.
|
|
FuzzFace2
AMC Addicted Joined: Jul/05/2007 Location: Angier, N.C. Status: Offline Points: 10356 |
Post Options
Thanks(0)
|
I am hoping my 70 Javelin has 3.54 gears too and should because it is a 390/4sp car but will not know till I drop the cover for oil change and count the teeth.
As for the 4 sp auto you may want to do a search or make your own post for it.
In short AMC only had 1 and it was used in later Jeeps.
Could use any og the GM atuo 4sp but need adapter to use them.
Lastly Gear Venders OD unit bolts on the back of your auto trany (727?) and turns it into a 6sp with OD.
Dave ----
|
|
TSM = Technical Service Manual
75 Gremlin X v8 for sale 70 Javelin 360/auto drag car 70 Javelin 360/T5 Street car |
|
sidewinder
Moderator Group Joined: Oct/07/2007 Location: Niagara Falls, Status: Offline Points: 6665 |
Post Options
Thanks(0)
|
About a year or so ago I discovered my 70 AMX with auto transmission and go-pac had 2.87 gears. With the go-pac it should have had 3.15 gears. I assume that the original owner opted fore the 2.87 for better highway driving ( calif. car) I bought a set of new NOS 3.15 gears from a forum member here and changed the gears. Not really a tremendous difference but a noticeable one. Also had to change the speedo gear......
Chuck Page |
|
Chuck Page ,AKA Sidewinder
1968 "BLACK CHERRY" Javelin Previous owner of 2013 Heritage Cup winner 1970 BBO AMX |
|
Post Reply | Page 123> |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |