Trans Cooler, exhaust sytem

[srchrls]

- -----Original Message-----
From: srchrls
To: Adohen
Date: Monday, January 18, 1999 5:50 PM
Subject: Re: Trans Cooler, exhaust sytem

>Transmission cooler is located in the left front wheel well where the air
>compressor was on the previous models. This is where the living area
battery
>is also located. Its a neat installation, I had Jim Rosenburgh in Sequim,
>Wa. do the install. He has a 26' 77 GMC but I don't remember the model.
>The headers and exhaust system are part of a "D/T Header GMC M/H 455 Davis
>Stage 1 Performance package".
>The headers are Thor or Thorsen.
>I erred when I said the exhaust was 3.5" it is 3.0". I just had to dig
thru
>the files to find the data. I keep track of this stuff until it is replaced
>or tossed out.
>
>srchrls
>
>
>Will check out the website a little later
>
>
>

 

[bartz paul]

IIRC, you indicated that your transmission cooler lines were removed from
the radiator cooler and routed to the transmission cooler and back to the
transmission. At the Marion GMCMI convention, Chuck Stoddard in his
transmission seminar recommended that the transmission fluid needed to be in
the vicinity of 200 deg F going into the pan. Perhaps one of you can verify
my recollection????? It was also recommended that if a separate
transmission cooler is used, that it be plumbed in ahead of the input to the
radiator cooler so that the output fluid temperature would be raised/lowered
to the design temperature prior to going to the transmission. The
implication was that transmission fluid too cool did not allow the
transmission to operate most efficiently.

If I have your configuration right, do you know what the output temperature
of your transmission fluid is from your cooler?

Paul Bartz

From: srchrls [mailto:srchrls]
Sent: Monday, January 18, 1999 10:52 PM
Subject: GMC: Fw: Trans Cooler, exhaust sytem

Transmission cooler is located in the left front wheel well where the air
compressor was on the previous models. This is where the living area battery
is also located. Its a neat installation, I had Jim Rosenburgh in Sequim,
Wa. do the install. He has a 26' 77 GMC but I don't remember the model.
The headers and exhaust system are part of a "D/T Header GMC M/H 455 Davis
Stage 1 Performance package".
The headers are Thor or Thorsen.
I erred when I said the exhaust was 3.5" it is 3.0". I just had to dig thru
the files to find the data. I keep track of this stuff until it is replaced
or tossed out.

 

[gary miller]

It is my understanding that as transmission temperatures go up, the life of the
fluid dramatically decreases and that 200 degrees is a temperature the one would
not want to exceed (for long). Ideally the temperature should "cruise" around
175 degrees. What logic is there for not wanting an even cooler fluid??? Does
not the efficiency (lack of slip) of the transmission increase as the
temperature of the fluid drops to 100 degrees? Someone not long ago posted a
chart of temperature of fluid versus life of fluid. I searched but couldn't
find it. I have just installed Ragusa trany and final drive pans, both with
temperature probes but have not yet had a chance hit the road and see what the
temps actually are.
Gary
'77 Kingsley
North Bend, Oregon Coast (where our "hills" are called "mountains" east of ol'
Miss.)

> IIRC, you indicated that your transmission cooler lines were removed from
> the radiator cooler and routed to the transmission cooler and back to the
> transmission. At the Marion GMCMI convention, Chuck Stoddard in his
> transmission seminar recommended that the transmission fluid needed to be in
> the vicinity of 200 deg F going into the pan. Perhaps one of you can verify
> my recollection????? It was also recommended that if a separate
> transmission cooler is used, that it be plumbed in ahead of the input to the
> radiator cooler so that the output fluid temperature would be raised/lowered
> to the design temperature prior to going to the transmission. The
> implication was that transmission fluid too cool did not allow the
> transmission to operate most efficiently.
>
> If I have your configuration right, do you know what the output temperature
> of your transmission fluid is from your cooler?
>
> Paul Bartz
>
> From: srchrls [mailto:srchrls]
> Sent: Monday, January 18, 1999 10:52 PM
> Subject: GMC: Fw: Trans Cooler, exhaust sytem
>
> Transmission cooler is located in the left front wheel well where the air
> compressor was on the previous models. This is where the living area battery
> is also located. Its a neat installation, I had Jim Rosenburgh in Sequim,
> Wa. do the install. He has a 26' 77 GMC but I don't remember the model.
> The headers and exhaust system are part of a "D/T Header GMC M/H 455 Davis
> Stage 1 Performance package".
> The headers are Thor or Thorsen.
> I erred when I said the exhaust was 3.5" it is 3.0". I just had to dig thru
> the files to find the data. I keep track of this stuff until it is replaced
> or tossed out.