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Username Post: 1962 powerglide        (Topic#366900)
robertljr 
Newbie
Posts: 7

Reg: 01-04-14
11-08-21 07:37 PM - Post#2830484    

Does the 62 iron and aluminum powerglide transmissions have the same vacumn modulators? I have viewed several and the screw in end seems to be different sizes on them. (i don't know which i have)and have viewed more than two different modulators. thanks in advance for any suggestions and help. Bob



 


Mercedes 
Contributor
Posts: 539

Reg: 07-09-18
11-09-21 03:44 AM - Post#2830493    
    In response to robertljr

The aftermarket parts catalog shows that both are the same part number. Both have an adjustable screw in the end. Years ago they may have been different part numbers.

Keep in mind that these are totally different design transmission. The aluminum version was offered on the 327 engine, the iron one on the 283 and inline 6.



 
dgstarr 
"4th Year" Silver Supporting Member
Posts: 282
dgstarr
Loc: Portland, OR
Reg: 04-16-13
11-09-21 07:52 AM - Post#2830502    
    In response to Mercedes

Caution: the 62 and early 63 aluminum Powerglide have a different modulator than the later cars . The later Powerglide modulators will not fit. The early modulator is more difficult to find.



 
robertljr 
Newbie
Posts: 7

Reg: 01-04-14
11-09-21 10:42 AM - Post#2830507    
    In response to Mercedes

Thanks Mercedes for your reply.I have a 327 and have been told that the year model determined the modulator.Now i find from you i might be able to specify which type i need. it seems the screw end is the difference on the used ones i have seen (nos) Can you tell me about the parts book you use and mention in your reply? Thanks a lot. Bob



 
robertljr 
Newbie
Posts: 7

Reg: 01-04-14
11-09-21 10:46 AM - Post#2830508    
    In response to dgstarr

dgstarr thanks for your reply to Mercedes in regard to my 62 327 modulator search Bob



 
Mercedes 
Contributor
Posts: 539

Reg: 07-09-18
11-09-21 10:54 AM - Post#2830509    
    In response to robertljr

I logged into Rock Auto to see parts for 1962 automatics, cast iron vs aluminum (62 327 vs 62 283).

Later model year Powerglide use a different modulator according to Rock Auto.



 
robertljr 
Newbie
Posts: 7

Reg: 01-04-14
11-09-21 11:11 AM - Post#2830512    
    In response to Mercedes

Thanks Bob



 
japete92 
"8th Year" Silver Supporting Member
Posts: 1817
japete92
Loc: No. Virginia
Reg: 01-18-13
11-09-21 02:33 PM - Post#2830522    
    In response to robertljr

I've attached screen shot from the '62 Shop Manual. It depicts the vacuum modulator installation but does not give a part number. Perhaps that is helpful.

That Manual also states the 327 was the only engine to 'get' the new (then) aluminum power glide.

Pete



Attachment: _62_vacuum_modulator.png (65.72 KB) 17 View(s)



 
robertljr 
Newbie
Posts: 7

Reg: 01-04-14
11-09-21 03:13 PM - Post#2830526    
    In response to japete92

Thanks i have wondered if i had the aluminum just thinking the 63 probably got it.Should be a lot less weight. i do have the 327 which one advisor told me today got it in 62 327 only.i found a modulator today that has red numbering on it and is adjustable for shift speed. No fitment given. Not on this sight as a seller here would tell you what it fits. new item large company.



 
robertljr 
Newbie
Posts: 7

Reg: 01-04-14
11-09-21 03:27 PM - Post#2830528    
    In response to japete92

Thanks Pete I have not seen the actual valve in your photo just the modulator part in the left hand in the picture. Is that valve an extra item to purchase also? Thanks



 
dgstarr 
"4th Year" Silver Supporting Member
Posts: 282
dgstarr
Loc: Portland, OR
Reg: 04-16-13
11-09-21 04:41 PM - Post#2830536    
    In response to robertljr

58-62 accept 327 (IRON PG) 3745169
62 327, 63 w/alum pg, 1st design 3812741
63 pg 2nd design and later years 5638205

All of the adjustable modulators I have seen were the later design. The later modulators will not fit the early alum PG because the actual valve is of a different diameter. Some after market catalogs show all alum pg modulators are the same, they are wrong!



Edited by dgstarr on 11-09-21 04:44 PM. Reason for edit: No reason given.

 
japete92 
"8th Year" Silver Supporting Member
Posts: 1817
japete92
Loc: No. Virginia
Reg: 01-18-13
11-09-21 04:51 PM - Post#2830537    
    In response to robertljr

  • robertljr Said:
Thanks Pete I have not seen the actual valve in your photo just the modulator part in the left hand in the picture. Is that valve an extra item to purchase also? Thanks



I know very little about auto transmissions (on purpose; I'm into manual ones) but:

An 'extra item'? I would say required; if you don't have one.

I highly recommend you acquire the 3 most important (in my opinion) manuals for your car. The full size car versions of the 1962 Assembly Manual; the 1962 Shop Manual (Supplement); and the 1961 Shop Manual. The '62 Shop Manual only has the 'supplemental' info to the '61 Manual. 'Supplemental' meaning only the stuff that has changed from '61 to '62.

They are not expensive and are the best source of reliable data for your car.

The link provides some useful info too:

https://www.gmheritagecenter.com/docs/gm-heritage-...

Pete






 
japete92 
"8th Year" Silver Supporting Member
Posts: 1817
japete92
Loc: No. Virginia
Reg: 01-18-13
11-09-21 04:55 PM - Post#2830538    
    In response to robertljr

  • robertljr Said:
Thanks Pete I have not seen the actual valve in your photo just the modulator part in the left hand in the picture. Is that valve an extra item to purchase also? Thanks



I know very little about auto transmissions (on purpose; I'm into manual ones) but:

An 'extra item'? I would say required; if you don't have one.

I highly recommend you acquire the 3 most important (in my opinion) manuals for your car. The full size car versions of the 1962 Assembly Manual; the 1962 Shop Manual (Supplement); and the 1961 Shop Manual. The '62 Shop Manual only has the 'supplemental' info to the '61 Manual. 'Supplemental' meaning only the stuff that has changed from '61 to '62.

They are not expensive and are the best source of reliable data for your car.

The link provides some useful info too:

https://www.gmheritagecenter.com/docs/gm-heritage-...

Pete






 
robertljr 
Newbie
Posts: 7

Reg: 01-04-14
11-09-21 05:51 PM - Post#2830546    
    In response to japete92

Thanks



 
dgstarr 
"4th Year" Silver Supporting Member
Posts: 282
dgstarr
Loc: Portland, OR
Reg: 04-16-13
11-10-21 08:09 PM - Post#2830601    
    In response to robertljr

Fatsco Transmission Parts has both the early and late modulators for the aluminum PG in their online catalog. Early is part # M-55 and late is 58-MT

fatsco.net is their web sight.



 
Eddy_Finn 
Newbie
Posts: 15
Eddy_Finn
Age: 57
Loc: Finland
Reg: 07-19-21
12-06-21 10:21 PM - Post#2832066    
    In response to dgstarr

What is the easiest way to indentify iron/aluminum PG on '62?



 
Mercedes 
Contributor
Posts: 539

Reg: 07-09-18
12-07-21 12:50 AM - Post#2832069    
    In response to Eddy_Finn

If it is behind a 283 or I6 it is likely a cast iron unit. Behind 327, aluminum.

Also, does a magnet stick to the case or not?



 
DonSSDD 
Silver Supporting Member
Posts: 7674
DonSSDD
Loc: Nova Scotia, Canada
Reg: 08-21-01
12-07-21 02:11 AM - Post#2832070    
    In response to Mercedes

The cast iron glide has a cast iron spacer between the transmission and the block plus the starter mounts to the spacer. The aluminum glide mounts directly to the block and has no starter mount.

63 Pontiac Parisienne Sport Coupe(CDN Chev mechanically (409, 4 speed),62 Bel Air SC (sold), 59 El Camino (sold), 62 Bel Air SC(sold), 63 SWC Vette (sold),
Member #2194


 
Mercedes 
Contributor
Posts: 539

Reg: 07-09-18
12-07-21 02:28 AM - Post#2832071    
    In response to DonSSDD

Thanks. I remember years back when I did my first 62 we bought an old parts car 4 door to use common parts. That old thing had a funny looking transmission. Looking back it was an old cast iron Powerglide.

Never really paid attention to those much. Must have weighed quite a bit, too.



 


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