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#1
01-30-2007, 09:20 PM
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'91 caprice classic tranny
My car has a LO3(305), but not to sure about the tranny, I was told 700R4, 4L60,and 4L60E! Which one is it,cause its burned up and would like to rebuilt it to save sum money.
Last edited by Mr. Rivera; 02-01-2007 at 04:38 PM. 
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#2
01-31-2007, 12:18 AM
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Re: '91 caprice classic tranny
Welcome to AF!
The transmission WON'T be a 4L60E - that's an electronic controlled transmission that first saw use in the Caprice in 1994 ('93 in other carlines). The 700R4 and 4L60 are for all intents and purposes, the same unit, although I refer to a particular trans as a 4L60 if it has an auxiliary valve body and a 700R4 if it does not. All made between 1987 and 1993 fit into this category (4L60) while 1986 and earlier are pure 700R4s.
__________________
1988 9C1 - Modified LM1 @ 275HP/350TQ - TH700R4 - 3.08 8.5" Disc Rear - see it at http://www.silicon212.org/9c1! 2005 Crown Vic P71 - former AZ DPS - 4.6 liters of pure creamy slothness! 1967 El Camino L79/M20 old school asphalt raper Remember - a government that is strong enough to give you everything you need, is also strong enough to take everything you have.
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#3
02-01-2007, 04:44 PM
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Re: '91 caprice classic tranny
You cant go wrong w/ a Dealership right? I gave them my last eight they told me 700R4 is what camn in it(everything is still OEM). A local transmission shop here in my home town looked @ it and told me 4L60. Is the dealership wrong?
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#4
02-01-2007, 05:15 PM
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Re: '91 caprice classic tranny
My '91 has a factory 700R4. 4L60's came later.
__________________
2007 Certified DaimlerChrysler Service Technician... True blue GM at heart.
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#5
02-01-2007, 07:20 PM
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Re: '91 caprice classic tranny
A "4L60" is a redesignation of the TH700R4. It is said to be easier to determine what it is to be used in with the 'new' designations. The way this works out is:
First digit is number of forward speeds Second digit is design - L for Longitudinal mount (front engine rear drive) and T is for Transverse mount (front engine front drive or mid engine rear drive [Fiero]). Third and fourth digits are the weight capacity (60 is 6,000 lbs GVW etc). So, in 1987 (yes this happened in 1987 - look it up), GM redesignated their transmissions. The transmissions that didn't get a redesignation are the TH200C and 4R models. TH400 became 3L80. TH700R4 became 4L60. TH125C became 3T40. Much of the paperwork on the cars continued to call the TH700R4/4L60 a TH700R4 into the 90s, but the fact is the official redesignation took place for the 1987 model year. TH700R4 and 4L60 are interchangeable terms beginning with the 1987 model year.
__________________
1988 9C1 - Modified LM1 @ 275HP/350TQ - TH700R4 - 3.08 8.5" Disc Rear - see it at http://www.silicon212.org/9c1! 2005 Crown Vic P71 - former AZ DPS - 4.6 liters of pure creamy slothness! 1967 El Camino L79/M20 old school asphalt raper Remember - a government that is strong enough to give you everything you need, is also strong enough to take everything you have.
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