How to Install a 4L80E into 1967 - 72 C10 / C20

[bry593]

Originally Posted by Accelo

The speedometer is also electronic and requires some type of conversion to work with the stock speedometer. It will connect to the aftermarket speedometers directly.

Well hell.... I knew I was forgetting something. Yes, I had T56CableSpeedometer.com convert the tailhousing to a drive bullet. The guy does nice work and the conversion has been problem free.

As for cost, it's less than a Gear Vendor's Overdrive. I paid $650 for the trans with converter from a local salvage. It was a 100k trans and the oil was clean, so all I did was install new solenoids and a filter ($100). Trans fluid was about $60. Driveshaft was $350 shortened, new joints and balanced. Speedo drive was $350. Flexplate and crossmember mount around $100. Lines and fittings about $75. The EZ-TCU bought on special for $650ish. Altogether was right at $2400 total.

Mind you, I did the conversion over Christmas of 2019, before the world went off the rails. I'd guess if parts are still available, expect 20-30% inflation.

[HO455]

Originally Posted by bry593

Well hell.... I knew I was forgetting something. Yes, I had T56CableSpeedometer.com convert the tailhousing to a drive bullet. The guy does nice work and the conversion has been problem free.

As for cost, it's less than a Gear Vendor's Overdrive. I paid $650 for the trans with converter from a local salvage. It was a 100k trans and the oil was clean, so all I did was install new solenoids and a filter ($100). Trans fluid was about $60. Driveshaft was $350 shortened, new joints and balanced. Speedo drive was $350. Flexplate and crossmember mount around $100. Lines and fittings about $75. The EZ-TCU bought on special for $650ish. Altogether was right at $2400 total.

Mind you, I did the conversion over Christmas of 2019, before the world went off the rails. I'd guess if parts are still available, expect 20-30% inflation.

How about an apples to apples comparison. Used GV to used 4L80 installation.

I bought my gear vendors with a T350 for $650. Sold the T350 for $100. Had a T350C built for $1200. New drive line $329. Add $100 for fluids, drain plug for transmission pan, and a new transmission mount. Done for $2200 in May of 2020. Overdrive with a lock up converter