1970

2004 5.3L in a 1970 Chevelle.

Cruiser, not a racer. Fuel mileage is the reason.

What year overdrive transmission should I be looking for?

Sarg

iTrader: (6)

If you are just leaving it stock it probably won't matter, but I believe 2002+ had some revisions that made them a touch stronger from the factory. Don't quote me on that year though. A 65 is going to have a 5 pinion planetary from the factory which also is a bit stronger.

Old Geezer

iTrader: (3)

My 65 4L6 has the updated parts. Came out of an 05, H2 Hummer.

Pocket

iTrader: (22)

95-08 whatever you can get the cheapest in working order

Bear in mind the older 1 pc case 4L60E's will require the crank adapter, but are wired/fit the same

Bo185

The 4l60e family 4l60/65/70 all have the same gear ratios and over drive. Only advantage is minor strength increases among them.

Any Gen III/IV 4l60/65/70 from 98-2007 will work. Make sure it was used with a Gen III/IV V8 as it could have the wrong converter to work with a 5.3L

1970

got it, 1998 or newer...

What are the changes between 1995 and 1998?

the search begins...

i r teh noobz

iTrader: (4)

The older ones (pre 98) came with old SBCs bolted to them. I think the PCM was different as well.

1970

somewhere I read a 700R4 Transmission Extension Tail Housing will fit on a 4L60 transmission and allow for a cable driven speedometer.
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Is that correct?
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Bo185

It will fit the 4l60 not the 4l60e with the 6 bolt tail house. The 700r4 are 4 bolts.

Pocket

iTrader: (22)

The older ones were a redesign of the 700R4. The external housing was almost identical. The newer ones were a redesigned 2 pc case. 96-97 was the transition, and yes even SBCs got the newer 2 pc case 4L60Es

PCM control did not change from 95-08. 94's and older did not have a PWM function which doesnt not play well with LSx PCMs for swaps

Older 1 pc case 4L60E's used the same 4 bolt tail housing as 700R4's which could be equipped with a cable VSS. The newer ones used a 6 bolt tailhousing which only came with electronic VSS. FYI, the PCM needs an electronic VSS signal to operate properly, so either use an older trans and a B4C camaro dual output VSS or full electric and a cable driver box with the newer trans