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Old 03-11-2013, 09:28 PM
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99 silverado 4.3 2wd with 4l60e, years that swap?

I have a 99 silverado 4.3 2wd with a 4l60e. The transmission is toast. What years and models could I find a swap from.

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Old 03-12-2013, 07:15 AM
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97-04 s10 4.3 0r a 98 up ck truck tahoe or surban with a 4.3-5.0-5.7
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Old 03-12-2013, 08:47 AM
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What about the tail housing and shaft
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Old 03-12-2013, 09:59 AM
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Originally Posted by wmb21379 View Post
What about the tail housing and shaft
What about them? So long as they're 2wd your golden.

I'm using a 1999 4.3 4l60e with the 3 piece case behind my 1997 Vortec 350 L31 that originally had the 2 piece 4l60e. A few bolts arent there as the newer trans has the 360 bellhousing, but it works fine.

The DBLF 4.3 V6 TC is desireable behind the V8's as they are the high stall speed TC's.

If you get a trans from a 1998-99 truck, or 98-00 Hoe or 98-99 Burb or 98-02 van(Express vans used L30/L31 into 2002) if the donor vehicle had a V8, be sure to use a V6 TC.
If your stock 4l60e has any chance of having any contamination in it, be sure to get a new TC, or a TC from a working V6 trans. The tag on the torque converter will have a 4 digit alphanumeric code on it. You are looking for DBLF. If you put a V8 TC behind your V6 your stall speed will be very low and your truck will be sluggish.

Here is a paste and cut from an Impala SS(1996) forum. Good info about the GM torque converter codes.
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Q: What will a a torque converter change do for the Impala?

A: Changing to a higher stall torque converter allows the engine to rev to its powerband faster, and to stay there while accelerating. Since all street converters for the Impala still lock up, there is no difference in cruise RPM's. GM offers torque converters of several different stall speeds for the 4L60E, 4L60, and 700-R4 transmissions.

The stock Impala converter is rated to stall at 1397 RPM (actual stall will be anywhere from 1400 to 1600, depending on engine torque output), while the highest stall converter GM offers is rated to stall at 2025 rpm (actual stall will be around 2000 to 2200 rpm, depending on engine torque output). The higher stall speed means greater torque multiplication which improves acceleration off the line. This also virtually eliminates the annoying creep while idling in drive as well as the clunk you sometimes get when shifting from park into either drive or reverse.

You can tell which converter you have by a 4-digit alpha code found on a sticker attached to the converter.

* DGHG = stock '94+ Impala converter
* DBCF = '86 'vette converter
* DBLF = '95+ L35 S10 truck converter

The code is interpreted as follows:

* 1st Digit: Transmission application
o D = 1984-1/2 and up 700-R4, 4L60, 4L60E
o C = 1984 and earlier 700-R4, 200-4R, 200C, 325-4L
o B = 250C, 350C
* 2nd Digit: K-factor (stall speed)
o K = K-85, 1211 rpm
o G = K-100, 1397 rpm
o F = K-110, 1611 rpm
o E = K-115, 1654 rpm
o B = K-140, 2025 rpm
* 3rd Digit = Clutch and Damper assembly
o C = ? (stock '86 'vette)
o H = ? (stock '94+ Impala)
o L = ? (stock '95+ L35 Vortec S10 truck)
* 4th Digit = Rear cover
o C = 3 lug round
o D = 3 lug round
o E = 6 lug
o F = 3 lug square
o G = 3 lug square

Going to the S10 converter increases stall speed by 628 rpm, which feels very good indeed. The factory 2025 rpm converter is an excellent, low cost upgrade that offers a very noticeable effect on performance without being too radical.

One area that some of the better (and more expensive) high stall aftermarket converters will excel in is durability in high HP applications. While the stock converter can live behind 300 to 350 HP with few problems, going to 400 HP or more can be pushing it. Actually in my experiences the trans will go before the converter, unfortunately when the trans goes the debris usually takes the converter with it (of course the opposite is also true).

Originally, the '85-'86 Corvette torque converter was recommended as an Impala upgrade. As you can see from the 2nd digit code this is a K-140 converter, which is the highest stall factory converter available for the 700-R4, 4L60, and 4L60E transmissions. The original part number for the '85-'86 'vette converter was #8650919, which was later changed to #24201203. GM only sells torque converters as what are called remanufactured units, but depending on the converter application you order, you may actually get a new converter instead of a rebuilt unit. Unfortunately since the '85-'86 'vette is an older application, you will almost certainly get a rebuilt converter if you order under that part number. Not only will the converter be used (rebuilt), but since then some of the internal components have been upgraded.

To get the high stall converter in an updated form with the latest design, order a similar K-140 high stall converter from a 1995+ 4.3L (RPO L35) S10 Truck V6 application (p/n 24202310). This new converter uses the same basic internal components (stators, etc.) as the 'vette converter, and as such has the same high stall speed rating (2nd digit code "B").

GM ranks converters by what they call a "K-factor", which indicates torque capacity and the resultant stall speed. Mark McPhail of GM Motorsports says both the '95 L35 Truck and the '85 Corvette converter described here have the same K-140 internals, resulting in the same stall speed given the same engine torque output. Since stall speed varies with engine torque, GM gives a rating of 2025 rpm, however this converter stalls at around 2200 rpm in a stock Impala.

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Good luck

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Old 03-12-2013, 06:25 PM
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Thanks a lot that really helps. Definetly gives more options
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