Question about 1998 Chevrolet C1500

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What transmission will interchange with my truck a 1998 chevy 1500 with a ext cab with a 4l60e

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  • sece2702 Apr 27, 2010

    whould one in a 1998 safari van 4.3l v6 be the same and would i need any thing else

  • Beth Jackson Apr 03, 2013

    I had the same problem but found this article online and it really saved me a lot of time. lol check this out, it has diagnoses for 30 different problems with the 4L60e:

  • Levoise Williams
    Levoise Williams Jul 28, 2014

    i have a 1997 Gmc Serria would a 2001 GMC serria Transmission work in my truck



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  • Chevrolet Master
  • 3,854 Answers

You can replace it with another 4L60E 1998 and newer and you can upgrade it to the 4L65E which is the same but uses 5 planetary gears in stead of 4 that is used in the 4L60E.
1998 was the change off year i believe where they started to section off the transmission in to three parts. The bell housing, body and tail end. The tail shaft housing uses 5 bolts to connect to the transmission and the 1997 transmission and earlier uses 4 bolts, but internal parts had no changes other then the 4L65E.
Thank you for using fixya and good luck.

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  • Harvey N Tawatao
    Harvey N Tawatao Apr 27, 2010

    The transmission will work great but your going to want to upgrade the boost valve to ensure that your not going to have any issues due to the added weight of the pick up truck and engine torque.

    The reverse boost valve and sleeve in the pump should be replaced every 40,000 miles (65,000km) to avoid damage to the transmission. Damage can occur when wear in the boost sleeve causes insufficient line pressure in reverse. Many major repairs of the 4L60E at around 50,000 plus miles are because of the boost valve and sleeve. The valve and sleeve can be replaced easily during a routine service of the transmission for around $50. This should be considered a necessary procedure if you are transplanting one into your pick up truck. Oversized (0.490" versus the stock 0.470" or 0.420") reverse boost valves are available that provide a moderate increase in pressure, and are a good addition to any 4L60E.

    Secondly, put a line pressure gauge (or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.490" or 0.500" boost valve (easy fix in pan).

    Thank you for using fixya



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4l60e transmission

Provided that your truck is 2WD and not 4WD, it looks like it will work. Check the length of both and make sure they match, the 2WD is longer than the one in the 4WD's and it dosent look like they can be interchanged without tearig into the casing and swapping parts.

Also check the bolt patterns on both, as some earlier versions of that transmission are 4 bolt instead of 6 bolt.

As far as the flywheel goes, you'll probably be ok with yours, I really cant answer that unfortunately.

Apr 27, 2010 | 1998 Chevrolet C1500

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