New here just picked up a 1990 K3500 Dually 7.4L TH400

[William Keiter]

Hello, wasn’t planning on buying this truck but it found me the past weekend. After seeing maintenance records and receipts I couldn’t pass on it.

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[HotWheelsBurban]

Very nice dually! Love the scenery too, makes the black and silver truck look even better! Ready to tackle anything you need it to.
Welcome to the forum!

 

[Wh4t3v3rs]

Welcome to the forum!!! Nice score on the dually!!!

 

[454cid]

Very nice. What's your axle ratio? I wonder what your mileage/RPM will be without OD. I've got a TH400 in my Buick, but the rear axle is a 2.XX.

 

[Silvio Iacuone]

Mint truck. How many miles?

 

[geeeee89]

that's sick

 

[William Keiter]

I looked at the RPO codes and believe the rear diff to be a 4:10 (GT5). I don't have a tach but it felt like about 3K running 65-70mph for the 1 hour trip home after purchase. I did the math and it got 10.6 MPG.

Previous owner said the engine was replaced at 75K miles. Odometer showing 118K miles but the odometer has been broke at least 18 months based on service records (going to swap plastic gear or cluster).

TH400 replaced with reman unit last summer, owner had full receipts and warranty from local shop.