I may be the only spokesman for 700R4's on this board, so I feel I should speak my mind here. I would just find a different tranny shop if I were you. My 700R4 has spent 45K miles behind 400HP in a K10 with gastly abuse - offroading, dragracing, and manical street driving - I've even pulled trailers in overdrive (just like you're not supposed too).
Granted, my 1-2 shift will chirp all four tires and my 2-3 (at around 70mph) will still spin the back tires. I do get slambed around a lot during normal daily driving. But I average 13.5 mpg with highway mileage as high as 16. Now I spent almost $3000 on this tranny. That may seem crazy, but that extra money has almost paid itself back over the past three years in what I have saved in gas money. My tranny has outlived a cam, timing chain, torque converter, two rearends, u-joints, brakes, and numerous engine and crossmember mounts. It is still performing like the day it went in.
Since I don't remember you have a bunch of mods on your engine, I'm thinking a good $1000 rebuild would outlast just about every other moving part on your truck. And if you plan on putting a lot of miles on your truck, the cost will eventually be worth the extra mileage.
Chris
1981 GMC K10 – 75K miles on original parts (what few are left)
Exterior Mods –
- Royal Blue chameleon paint
- 15X11 Craiger chrome wheels
Interior Mods –
- B&M Light Truck Mega Shifter
- Grant steering wheel
- 6 Auto Meter Ultra Light gauges in dash, 2 on a-pillar
- Keyless entry
- Billet dash and door trim
- Solid headboard with four built in speakers
- Sony Mobil ES CD Deck, MTX truck boxes, Jensen AMP
Drivetrain Mods –
- GM Racing ZZ4 Engine with H.O.T. Cam kit, 150 amp alternator, PeteJackson Gear Drive
- Hooker SS headers, 2 1/2" SS exhaust, Dr. Gas x-pipe, Flowmaster 2 chamber mufflers
- K&N X-Stream lid and 14" air cleaner.
- Coan 3000RPM custom built torque converter
- Built-up 700R4 transmission
- Yukon 4.11 gears with titanium pins in stock 10 bolt front and 12 bolt rear.
- Eaton heavy duty locker.
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