Rebuilding my 727 over the winter. Since I run a stock drum, I bought a transmission blanket to keep things safe. I can't believe how heavy this thing is and it certainly seems that it would hold heat. Will it be an issue on longer drives? It's a Chute Metal Products blanket.

Is a blanket overkill at my power level (approx 510 hp)? And are they all this thick and heavy? The 727 has a low band apply manual valve body and will have a bolt-in sprag. Runs a stock 4-disc low drum.

Thanks for any productive input you may have.

I ran a RCI full tranny blanket on my old Duster, I had a electric tranny temp gauge on it and the tranny temps. never exceeded 200 F with a 10 inch Continental street and strip converter and later a Turbo Action 9 inch SS/AH converter in the car My blanket didn't cover the bell housing area and I didn't run a dust cover on the front of the trans either so that may have had some impact on the tranny temps. I did have the Mopar brand stamp steel deep tranny pan on it and one medium size tranny cooler on the front of the radiator also with no tranny fluid going into the radiator tranny heater

It WILL hold heat in..but will it make a difference..
on long trips.. probably will if you have a high stall
conv.. a big trans cooler helps a lot

I run the Lofgren blanket on the Challenger. I do more street driving than racing, and it seems to work fine. I just run the stock radiator with a cheap add-on trans cooler on the front of it.

I always ran the short Lofgren also. I combined that with a JW Ultrabell.

Too many air leaks for you to notice a change.

Long trip = continuous low throttle position + high vacuum = low power = no heat build-up.
If your ATF temp hasn't stabilized in 5 miles something is wrong.
Where to measure AFT temp: at its hottest point - the line out of the transmission going to the cooler. I've seen gauges plumbed into the return line, which tells you the cooler is working but nothing else.

You and I differ here.. I want to know what the temp
is in the pan.. thats the fluid waiting to go into
the trans itself.. on outlet temps.. thats jumping all
over to an extent

To answer the OP's question...No, a blanket will not affect your trans temperature on the street.

The fluid is "working" and being stressed while it is in the converter. After this it is discharged into the cooler circuit, so monitoring here is what tells you how hard the fluid is being worked. The fluid in the pan is virtually the same temp as the trans itself. Not sure what benefit knowing that is, plus as stated, the efficiency of the cooler or lack thereof can effect that.

Will a blanket effect the heat? Of course it will. Aluminum rapidly dissipates heat, that's why we run an alum pan vs a steel one. So you put a blanket on your alum case, it makes it dissipate heat slower. That's basic physics and thermo dynamics. Will it make it too hot for a street car?.......probably not

I read about this topic 100 times before putting a blanket on my car.

I will give you my first hand experience.

727 with multiple converter's that stalled in the 2200-3000 range on motor. This would equate to around 5000 or so on the trans brake with boost.

Now driving around, you're not into boost very often, so it's a fairly tight unit for regular driving.

I had a deep steel 727 pan on it, with an RCI blanket (fairly short, only covering the main case area.

I started with a nice size 14 x 14 tube/fin cooler mounted in front of the radiator. Long hauls, or making rounds would get the trans REALLY hot. Added a second trans cooler under the car (8 x 12") which marginally improved it, but still did not solve the issue.

We're talking 300 degree's hot... enough to melt the front pump seal in round robin bracket racing, and spew fluid everywhere.

At the same time I went to an aluminum B & M pan and a CSI carbon shield. Since then the temp has NEVER gotten over 200 degree's in any situation.

I can't say for sure that it was the blanket or pan alone that solved it, but I can tell you FOR SURE one of those two was causing me a HUGE issue. Since I had used that pan on cars before with looser converters and not had this issue, I tend to really blame the blanket for causing the heat problems.

Can't say why some guys get away with it, and not have any problems. But I can say that the blanket did give me issues...

I have been running a blanket for about 3 years on the street in my 63. I have noticed no difference at all and I have taken long cruises and the temps all seem to be the same as it has caused no issue even on very hot summer days. Ron