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Old 07-29-2006, 11:27 PM   #21
Frank S
 
1973 27' Overlander
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Hi ROBERTSUNRUS--The reference to the Chevy 5.3ltr 4.10 limited slip axle was what works just fine for me with my A/S. Chevy never had a "hydromatic", but they do have a 4-speed automatic transmission. We are all interested in what works or doesn't work for others. I agree that reading and understanding the owners manual is a must. The door sticker, VIN, hitch sticker, and tire info, are also important to determine which specific items in the owners manual pertain to your vehicle, as the owners manual also contains info that does not apply to your vehicle.--Frank S
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Old 07-30-2006, 09:20 PM   #22
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"Chevy never had a Hydromatic"

Mr. Frank S. Never say never was a statement from one of my science teachers in high school. [just a few years back] Hydromatic was actually a truck transmission and Chevrolet did make trucks. Also Hydromatic was highly used in Oldsmobiles and believe it or not Hydromatics were used in early fifties Lincolns, made by Ford. [The Lincolns were made by Ford, not the Hydromatics.] Also as a Chevrolet mechanic in the late sixties I personally repaired Powerglides, Turbo 350's, and Turbo 400's used in vertually all Chevrolets. Please note: Turbo was short for Turbo-Hydromatic.
Thank You & have a nice day.

Bob
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Old 07-31-2006, 12:03 AM   #23
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Hi ROBERTSUNRUS--Chevy never had a "hydromatic". GM did have a division named Hydramatic, and the automatic transmission they manufactured was called a Hydramatic. These transmissions were used by all GM vehicle divisions, except Buick, for both cars and trucks, as well as Lincoln, and Rolls Royce. In a GM reorganization in the 70's Hydramatic division was rolled into the GM Powertrain Group, and the Hydramatic name discontinued. Prior to the formation of GM Powertrain, Chevy made Powerglides, and Buick made Dynaflows. A few Dynaflows even found their way into Caddys around 1952 when the Hydramatic plant completely burned down, but only for a month, as Hydramatic was back in production in 30 days, led by Don Boyce, who later became a GM VP.--Frank S
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Old 07-31-2006, 12:24 AM   #24
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Two snaps in a Z formation. Frank is ahead.
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Old 07-31-2006, 12:45 AM   #25
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Your right Frank S. I spelled it wrong. Hydramatic not Hydromatic, But I will still stick to my story Chevrolet used Hydramatics.

Bob

PS All this information on transmissions plus a $5.00 bill might buy you a bag of popcorn or cup of coffee.
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Old 07-31-2006, 12:59 AM   #26
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Hi ROBERTSUNRUS--You are correct. As I indicated above, all GM vehicle divisions except Buick used Hydramatic transmissions, and Chevrolet is a GM vehicle division.--Frank S
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Old 07-31-2006, 07:43 AM   #27
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Originally Posted by Jim Clark
dmac do you turn off the overdrive? I find that when I do my transmission runs at 180 degree.

Jim
Yes - I have driven long distances with the OD off. I have then tried OD on, and actually found the temp to drop a little. My tranny temp is also dependant on outside air temperature. Unless the tranny is hunting due to a long slight grade or headwinds, I advise OD on.

However, on the steep grades I was referring to... the truck never gets to 4rth, or even 3rd gear. It's in 1st or 2nd going up the steep incline of I-70 approaching the big tunnel in Colorado or going over the high passes. It heats up fast, rising to 210-215 (with outside temperatures of ~85). I stop at turnouts and let it idle to cool down before proceeding. It takes longer to cool down (15 min) than it takes to heat up (5 min).

Also, wind direction seems to play a huge role in gas mileage. With a moderate headwind (10-20 mph) I got 11.5 mpg, but with a tailwind I got 14 mpg.
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Old 08-02-2006, 03:02 PM   #28
Frank S
 
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Hi dmac--At 62mph I run 2000rpm in 4th gear, and 3000rpm in 3rd gear with a 5.3ltr, 4.10 rear, in a 2001 1/2ton Suburban. At 3000rpm I'm in the torque sweet spot which seems to yield better overall performance, and control of the total rig. I never tow in 4th, and with the tow/haul mode, am able to tow mainly in the torque sweet spot.--Frank S
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Old 08-02-2006, 04:55 PM   #29
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Quote:
Originally Posted by dmac
Yes - I have driven long distances with the OD off. I have then tried OD on, and actually found the temp to drop a little. My tranny temp is also dependant on outside air temperature. Unless the tranny is hunting due to a long slight grade or headwinds, I advise OD on.

However, on the steep grades I was referring to... the truck never gets to 4rth, or even 3rd gear. It's in 1st or 2nd going up the steep incline of I-70 approaching the big tunnel in Colorado or going over the high passes. It heats up fast, rising to 210-215 (with outside temperatures of ~85). I stop at turnouts and let it idle to cool down before proceeding. It takes longer to cool down (15 min) than it takes to heat up (5 min).

Also, wind direction seems to play a huge role in gas mileage. With a moderate headwind (10-20 mph) I got 11.5 mpg, but with a tailwind I got 14 mpg.
I never tow with the OD on, and the rtuck runs cooler with the OD off. The tranny will climb in temp if I leave the OD on. I have found that once I let it get hot it takes a while to cool. I do not pull on the grades you do. I may start soon , I just returned from a meeting in which I was offered a postion in Denver. The next truck will be a 250.

Jim
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