Which Hump?

[DaddyMack]

Can you guys help?

Here are a couple shots... not sure which one I have... thanks!!

[4dranch]

what are you asking?

[63deluxfleet]

i think he means which transmission hump does he have ie: high, low manual, auto... etc i have no knowledge of these but just thought id chime in...

[4dranch]

Thats what I was thinking also...
If that is what you want to know, you do have the high hump...

[DaddyMack]

Originally Posted by 4dranch

Thats what I was thinking also...
If that is what you want to know, you do have the high hump...

Yup.. and thanks!!! just wanted to be sure... I was getting mixed up because it is removable and I thought I read somewhere the removable was the low.

[padresag]

it ist he high hump that is removable for the 4 spd trans. some l/humps were removable. did your truck have the hydramatic in it by any chance?. I see that yours has a place for the cutout for the shifter rof the 4 speed
ron

[DaddyMack]

Originally Posted by padresag

it ist he high hump that is removable for the 4 spd trans. some l/humps were removable. did your truck have the hydramatic in it by any chance?. I see that yours has a place for the cutout for the shifter rof the 4 speed
ron

Don't know original... I have 350 in it now.

[4dranch]

Here is some info on the low hump. Hope this helps out.
http://67-72chevytrucks.com/vboard/s....php?p=3585810

[MacAttack]

What Hump?

[padresag]

Originally Posted by DaddyMack

Don't know original... I have 350 in it now.

I don't know what year that your is but the hydramatic was used up to 62 and they were built more like a barrel than the later aluminum powerglides. The a/powerglide reduced in height right behind the t/convertor. The hydramatic went pretty well straightback in that area which is why it would more than likely have a high hump whereas a p/glide used the low hump
ron

[LILRED66]

All automatics, both Powerglides & Turbo Hydra Matics, and 3-speeds on the column, came from the factory with low hump tranny covers...some removeable, some not. The removeable high hump trucks had granny-low 4-speed transmissions.

[padresag]

[QUOTE=LILRED66;3623206]All automatics, both Powerglides & Turbo Hydra Matics, and 3-speeds on the column, came from the factory with low hump tranny covers...some removeable, some not. The removeable high hump trucks had granny-low 4-speed transmissions.[/QUOTE

we are using 2 different transmissions or are talking about 2 diffierent transmissions here. I mentioned the hydramatic and you mentioned the turbo-hydramatic. actually upon checking the hydramatic was used in trucks up to 1964 when it was replaced by the aluminum cased turbo-hydramatic, eg; turbo 350-400
the hydramatic was a cast iron cased transmission quite differently designed and built from it's later model, the turbo-hydramatic
though the year of the truck is not mentioned the frt door posts place it within the timeframe that the hydramatic was still being made and utilized.
they quite using the hydramatic ( this model was basic from from 1957) in car after 1960 when another a/case hydramatic or turbo-hydramatic was employed called the slimjim.
the hydramatic was a taller unit than it's follower
ron

[4dranch]

Originally Posted by MacAttack

What Hump?

[LILRED66]

I pulled the terminology from the Chevrolet Truck encylopedia and the General Motors Silver Book, so I was simply stating that there were two automatics available in the '60-'66 Chevy trucks...one was a 2-speed Powerglide and the other was a 3-speed Turbo Hydra Matic, per the published literature.

[padresag]

actually there were 4 between 60-66. there was a cast iron p/glide which was used up until 62 as was the cast iron hydramatic. in 63 the aluminum powerglide was introduced and put into production and the aluminum cased turbo-hydramatic in 64
both the cast iron and the aluminum p/glides were a 2 speed. the cast iron hydramatic which was used from 53-62 was a 4speed while the aluminum turbo hydramatic was a 3 speed
ron

[LILRED66]

In any event, there were two humps used in '60-'66 Chevy/GMC, series 10, 20 & 30 trucks...the high hump, coupled with the 4-speed transmissions (SM420 & SM465) and the low hump, coupled with the 3-speed manual transmissions & 2-speed and 3-speed automatic transmissions. The casting material of the transmission did not determine the hump style, so I wasn't trying to give a dissertation on the evolution of the automatic transmissions, simply a general rule-of-thumb on what hump style came with what transmission type.

Thanks for your input on the evolution of the Powerglide and Hydra Matic transmissions. I will keep it handy.

[padresag]

"The casting material of the transmission did not determine the hump style, so I wasn't trying to give a dissertation on the evolution of the automatic transmissions, simply a general rule-of-thumb on what hump style came with what transmission type.
"
and what I am referring to is the external dimensions of the the cast iron hydramatic required that it used the high hump in the years that it was utilized
ron
I did re and re quite a few hydramatics back in the 60's .hydramatics.
I also installed a few olds and caddy engs w/hydramatics in some of my early vehicles

[brawley]

Are the bolt in high hump pans interchangable with the low hump?

[LILRED66]

Yes, but the intermediate tranny front cover is not interchangeable from the low hump to the high hump.

[LILRED66]

Originally Posted by padresag

"The casting material of the transmission did not determine the hump style, so I wasn't trying to give a dissertation on the evolution of the automatic transmissions, simply a general rule-of-thumb on what hump style came with what transmission type.
"
and what I am referring to is the external dimensions of the the cast iron hydramatic required that it used the high hump in the years that it was utilized
ron
I did re and re quite a few hydramatics back in the 60's .hydramatics.
I also installed a few olds and caddy engs w/hydramatics in some of my early vehicles

Your criteria runs counter to the published literature by GM, so you must know something they don't.

I sold a factory 3-speed automatic a few months ago, with a factory low hump, so it must have been one of the exceptions. I wil be on the lookout for others equipped this way...maybe they are more rare...an automatic with a high hump.

[padresag]

Originally Posted by LILRED66

Your criteria runs counter to the published literature by GM, so you must know something they don't.

I sold a factory 3-speed automatic a few months ago, with a factory low hump, so it must have been one of the exceptions. I wil be on the lookout for others equipped this way...maybe they are more rare...an automatic with a high hump.

for your info turbo hydramatics are 3 speeds(alum case) the just plain old hydramatic(cast iron) was a 4 speed.
Ron

[padresag]

Originally Posted by LILRED66

In any event, there were two humps used in '60-'66 Chevy/GMC, series 10, 20 & 30 trucks...the high hump, coupled with the 4-speed transmissions (SM420 & SM465) and the low hump, coupled with the 3-speed manual transmissions & 2-speed and 3-speed automatic transmissions. The casting material of the transmission did not determine the hump style, so I wasn't trying to give a dissertation on the evolution of the automatic transmissions, simply a general rule-of-thumb on what hump style came with what transmission type.

Thanks for your input on the evolution of the Powerglide and Hydra Matic transmissions. I will keep it handy.

the SM465 was not in production until 68 I believe.
ron

[padresag]

this is a picture of a hydramatic which was used fro 53 thru to 62.

By rondavid, shot with E8800 at 2009-11-22
high hump 60-62 w/hydramatic. this is also a different h/hump as you can notice that the firewall piece is also bolted in instead of being wlded in. the join line between the firewall and the hump comes across staggered and on a diagonal

By rondavid, shot with E8800 at 2009-11-22

By rondavid, shot with E8800 at 2009-11-22

By rondavid, shot with E8800 at 2009-11-22

By rondavid, shot with E8800 at 2009-11-22

By rondavid, shot with E8800 at 2009-11-22
ron

[LILRED66]

That would also be a GMC truck and I can't tell you much about those. In any case, I learn something new everyday! I attempt to go by what I read, coupled with what I see in the field, when formulating my opinion, but I see there are no hard, fast rules when it comes to the '60-'66 Chevy/GMC trucks.

I have a customer telling me about his '61 Chevy C10, that was sold as a "farm addition", without turn signals and only one taillight. It also only has two fused circuits in the factory fuse block. I have never seen, in person, or heard of a "farm addition" truck from the '60-'66 Chevy/GMC line.

In any case, thanks for sharing your infinite wisdom. By the way, I have never seen that tranny in your picture...what a dinosaur.

[padresag]

the hydramatic shown is the old workhorse. it was used in 53-56 olds,caddies and pontiacs; also chev and gm trucks from 53-62. in 57 the hydramtic Jetaway trans was introduced to the car divisions but stayedd the same in light trucks up to 62.
. this was also the trans that launched B & M's reputation as these were built for drags.
I did work for this co. http://www.tcsproducts.com/ back in the mid 60's and was more then likely the first to develop a stall speed convertor here and that was done by modifying the stator. built one for ford in 65. the co. had a different name then. B.C. automatics and the convertor shop was Crestwood engineering. the fellow that owns it now started working there in about 61.
he was racing in vegas about 2 weeks ago running in the 7.'s. Bob Marshall motors
Back to the hydramatic. perhaps the reason for the high hump (may not have been for physical clearances) but for room to adjust the bands. there were 2 adjs on the top just in from the side cover and for the dipstick/filler tube. in the earlier models there must have openings in the floor for the adj and to check fluid level as there was no filler tube as such as it was just a cap with dipstick attached
they were also a little heavier than your modern turbo-hydramatic
ron