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Using a 742 pinion in a 741 case via slight modification Jump to page : 1 Now viewing page 1 [50 messages per page] | View previous thread :: View next thread |
Forward Look Technical Discussions -> Transmission and Rear Axle | Message format |
1960desotoman |
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Member Posts: 26 Location: Estes Park, CO. | I am looking for a 2.94 or 2.76 rear end for an early 741 differential case (casting number 1820657) and all I can find are 742 case ring and pinion sets in that particular ratio. As I understand the 741s have a 1-3/8" pinion stem and the 742s have a 1-3/4" pinion stem. My brother has a machine shop, so I'm wondering if a 742 pinion stem could be machined down to 1-3/8" and fit in a 741 case. Both are 10 spline and I believe the splines are the same size between the 741s and the 742s. p.s. if anyone knows where I could find a 741, 10 spline, 2.94 or 2.76 ratio ring and pinion for less than $300 that would be ideal. | ||
57chizler |
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Expert Posts: 3777 Location: NorCal | https://www.ebay.ca/itm/NOS-Mopar-2070296-RING-GEAR-PINION-2-93-1-57... | ||
1960desotoman |
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Member Posts: 26 Location: Estes Park, CO. | Hmm. Well now I feel silly. I suppose I was using the wrong key words. Thanks! | ||
Powerflite |
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Expert 5K+ Posts: 9670 Location: So. Cal | When I recommended you to get 2.76 gears, I didn't mean to purchase just the gears. I meant to purchase the whole third member (used) all together and swap it out. Another option is to swap out the entire rear end with one from a '65-'69 C-Body. I'm not sure from the description here, but maybe this one is a C-body rear end? They are a direct replacement. The only thing you have to do is to maybe move the brake hose mount position or use a longer hose on it. https://denver.craigslist.org/pts/d/denver-mopar-axle/7247567857.htm... If the perch spacing is 46", then it is likely a C-body axle. If it is 44", it is a B-body. Edited by Powerflite 2021-01-10 8:24 PM | ||
1960desotoman |
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Member Posts: 26 Location: Estes Park, CO. | Is it necessary to replace the whole third member? | ||
Powerflite |
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Expert 5K+ Posts: 9670 Location: So. Cal | You can replace just the gears with 2.93 as Chizler showed, but it is a lot more expensive and the labor to do it isn't cheap either. A used full third member will likely cost you $100. | ||
NM Desoto |
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Veteran Posts: 145 | I've got a 741 case with 2.94 gears and a 742 case with 2.76. Neither are limited slip. The 741 has been in inside storage for several years,but will need a good cleaning. The 742 is still in the car. | ||
1960desotoman |
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Member Posts: 26 Location: Estes Park, CO. | Powerflite - 2021-01-10 8:17 PM You can replace just the gears with 2.93 as Chizler showed, but it is a lot more expensive and the labor to do it isn't cheap either. A used full third member will likely cost you $100.
After reading through the rear axle section in my service manual, I see what you mean. Unfortunately I have been having difficulty finding one that cheap, but I've got time to find one. Thanks for the input! | ||
1960desotoman |
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Member Posts: 26 Location: Estes Park, CO. | NM Desoto - 2021-01-10 9:31 PM I've got a 741 case with 2.94 gears and a 742 case with 2.76. Neither are limited slip. The 741 has been in inside storage for several years,but will need a good cleaning. The 742 is still in the car.
Either one of those for sale perchance? Edited by 1960desotoman 2021-01-11 3:42 AM | ||
57chizler |
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Expert Posts: 3777 Location: NorCal | If your car doesn't currently have Sure-Grip, swapping in any '64 or later third member or one with Sure-Grip will require shortening your axle shafts 1/8". This is because the internal thrust block is wider in those. | ||
1960desotoman |
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Member Posts: 26 Location: Estes Park, CO. | Ok. Just this morning I purchased a '66 plymouth rear end with 2.94 gears. Were all post 64' rear ends sure grip or was it an option? My current rear end is not a sure grip. | ||
1960desotoman |
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Member Posts: 26 Location: Estes Park, CO. | <p>Ok. Just this morning I purchased a '66 plymouth rear end with 2.94 gears. It appears to be a non-sure grip model unfortunately. My current rear end is not a sure grip.</p> Edited by 1960desotoman 2021-01-11 12:53 PM | ||
Powerflite |
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Expert 5K+ Posts: 9670 Location: So. Cal | No, it was always an option. What model of '66 Plymouth did it come from? What are the dimensions on it? Edited by Powerflite 2021-01-11 12:53 PM | ||
1960desotoman |
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Member Posts: 26 Location: Estes Park, CO. | It came from a Plymouth Fury. It is a 741 case, the same as my current rear end. | ||
Powerflite |
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Expert 5K+ Posts: 9670 Location: So. Cal | Perfect. C-body, so it should bolt right in as a direct replacement, other than the hose issue that I stated before. | ||
1960desotoman |
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Member Posts: 26 Location: Estes Park, CO. | Great! That's what I assumed. | ||
NM Desoto |
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Veteran Posts: 145 | They are both available, but it appears that you have found one locally. let me know if there are any changes. | ||
1960desotoman |
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Member Posts: 26 Location: Estes Park, CO. | Ok, I'll keep it in mind. | ||
RICKYMOPAR |
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Veteran Posts: 292 Location: Colorful Colorado skier on the license plate | Ian, Wish I had seen this thread earlier, may be able to help. A little over an hour away. Broomfield 80021 | ||
1960desotoman |
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Member Posts: 26 Location: Estes Park, CO. | I'm glad to find another Mopar enthusiast nearby! I bought a 2.92 third member and I'm just procrastinating on putting it in at this point. Do you have a DeSoto? | ||
RICKYMOPAR |
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Veteran Posts: 292 Location: Colorful Colorado skier on the license plate | Ian, not at this time, I have owned DeSoto's in the past ..Just sold my perfect 58 steering wheel to another member Not for too much. I formerly owned 2, 57 Firedome 2DHT and 3, 58 Explorer wagons, one was a two door. Edited by RICKYMOPAR 2021-02-22 4:59 PM | ||
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