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Old 08-11-2016, 03:47 PM
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Default '58 Rear Motor Mount

Wondering if anybody has a source or stash of rear motor mounts for a '58. These are the ones that bolt to the bell housing. Looks similar to the one below.

I think CPR might have some but I've never actually bought from them. Any opinions on that route?
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Old 08-12-2016, 11:17 AM
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I've always had good luck with CPR, give them a call.

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Old 09-06-2016, 10:49 AM
Skankin' Rat Fink Skankin' Rat Fink is offline
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From CPR's website:

C529880RP 1958 Motor Mount, Rear, All, LH $37.95/ea
C529879RP 1958 Motor Mount, Rear, All, RH $37.95/ea

I bought 1955 motor mounts from them, and they are nice quality.

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Old 09-06-2016, 11:44 PM
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I've got a set of new ones from my 57 I believe they are the same.
Let me no if interested, I'm in Mich.

GT.

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Old 09-07-2016, 08:24 AM
Skankin' Rat Fink Skankin' Rat Fink is offline
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Quote:
Originally Posted by blueghoast View Post
I've got a set of new ones from my 57 I believe they are the same.
Let me no if interested, I'm in Mich.

GT.
They are not the same.

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Old 09-07-2016, 09:15 AM
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I think he's right... All the stuff I'm seeing is 55-57. 58 is always listed separately. Thanks though.

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1966 Bonneville Wagon (Factory 421,3x2,4spd, 9 passenger) On the road!!
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Old 09-07-2016, 11:23 PM
Goatracer1 Goatracer1 is offline
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Do you have the old mounts? One of the reproduction rubber companies would remolded your old ones. I don't remember if it was STEELE or one of the others.

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Old 09-08-2016, 10:00 AM
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Problem is that this is my daily driver. Whatever job I start on Friday afternoon, I have to have wrapped up by Monday morning to get to work.

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1958 Chieftain Safari (370,4 spd, 9 passenger) Daily Driver
1966 Bonneville Wagon (Factory 421,3x2,4spd, 9 passenger) On the road!!
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Old 11-12-2016, 10:21 AM
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Still looking. CPR let me order them before sending me an email that said they are discontinued (but would re-vulcanize them for double the price of the parts for sale on the website.)

But again, I can't have it out of service for the 3 weeks they say it will take.

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1958 Chieftain Safari (370,4 spd, 9 passenger) Daily Driver
1966 Bonneville Wagon (Factory 421,3x2,4spd, 9 passenger) On the road!!
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Old 11-12-2016, 10:37 AM
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Left http://www.ebay.com/itm/NOS-1958-Pon...5YF-Yg&vxp=mtr

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Old 11-13-2016, 08:18 AM
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Kanter is showing them, see this link. Expensive for right side and exchange only. I checked Ames and they don't list them.

Difference in 1955-57 and 1958 mounts is in location of holes in upper part that attaches to the transmission or bell housing. I've seen them with holes drilled for both allowing them to be used on 1955-58.

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Last edited by Safari Larry; 11-13-2016 at 08:20 AM. Reason: Wrong years
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Old 11-13-2016, 10:24 AM
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Quote:
Originally Posted by Safari Larry View Post
Difference in 1955-57 and 1958 mounts is in location of holes in upper part that attaches to the transmission or bell housing. I've seen them with holes drilled for both allowing them to be used on 1955-58.
If a guy had a '58 right side for a bolt pattern, could he drill the 55-57 part to fit?

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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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Old 11-13-2016, 12:16 PM
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Quote:
Originally Posted by Bill Hanlon View Post
If a guy had a '58 right side for a bolt pattern, could he drill the 55-57 part to fit?
I wondered about that too but I don't have the answer. The 58 holes are a little closer together than the 55-57 so it might be possible.

I've attached overlaid drawings of the 55-57 mounts and the 58 mounts. These drawings are from the Shop Manuals (57 & 58), 57 in red and 58 in black.

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Old 11-13-2016, 12:31 PM
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After looking at some photos, I think I may have that backwards, I now believe the holes in 58 mounts are further apart than the holes in 57 mounts. That would probably prevent drilling 55-57 mounts to fit 58.

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Old 11-14-2016, 03:19 AM
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Any chance '55-57 Chev rear mounts could work or be made to work? The general configuration looks it might be the same as Pontiac.

I've got a pair of rear mounts in a drawer (used but like new) that don't show any part numbers. They look just like the Chevy mount in the picture, except that the lower metal flange is in the same plane as the upper piece, instead of being at 90 degrees. Anybody know what they might be? I thought they were remnants of my putting early Pontiac engines into a couple of '57 Chevies, but I don't know (that was over 50 years ago!). Bill Hanlon- perhaps Pontiac in GMC? Or maybe '55-56 Pontiac?
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Old 11-15-2016, 06:03 PM
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Thanks for putting in some brain power on this for me everyone.

I did see that one on e-bay, and maybe I should get it while it's out there. The fact that Kanter want's $175 for the right hand side (exchange) seems a bit like gouging to me. CPR said they would re-vulcanize them for me for $140. That might be an option, but I just need to figure out how to make that work being a driver. I really need to get my 66 up and running I guess.

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1958 Chieftain Safari (370,4 spd, 9 passenger) Daily Driver
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Old 11-16-2016, 10:02 AM
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Anyone ever look at the oldsmobile mounts? Or have a drawing to compare like Larry did above? Might still need to be re-drilled, but it looks pretty close.
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Thad
1958 Chieftain Safari (370,4 spd, 9 passenger) Daily Driver
1966 Bonneville Wagon (Factory 421,3x2,4spd, 9 passenger) On the road!!
  #18  
Old 05-26-2023, 12:38 AM
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Teej, did you use the Oldsmobile mounts?

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