QuestionI have a customer who has a 1999 silverado 4.3L manual transmission and is replacing his engine. I sent him an engine out of a 1999 s10 blazer 4.3L automatic. The customer switched the flywheel/flexplate from his engine to the new engine and put a new pilot bearing in and is now saying that the transmission wont bolt up. He says that it is almost like the crank is not machined out enough and there is a lip preventing the shaft from the tranny to go all the way in. Have any ideas what may be going on here? I sold a ton of 4.3L engines and have never ran into a problem like this.
Thanks
AnswerHi Jamie,
Here is the complete interchange for the '99 Silverado. Your direct interchange (the vehicle the engine is going into) is the "C" interchange. Not unexpected, the interchange for the Blazer engine is also the "C" interchange so those two should be exact-fit UNLESS someone was in there before you and switched out the engine or trans previously.
A ----------
ASTRO 96-98 (4.3L, VIN W, 6-262)
BLAZER S10/JIMMY S15 96-98 (4.3L, VIN W, 6-262)
BRAVADA 96-98 (4.3L, VIN W, 6-262)
CHEVROLET VAN 96 Express, 6-262 (4.3L, VIN "W")
CHEVROLET VAN 97-98 4.3L (VIN W, 6-262)
CHEVROLET VAN 99 4.3L (VIN W, 6-262), ID ABA & ABC (standard bell housing bolts)
CHEVROLET 1500 PICKUP 96-98 6-262 (4.3L, VIN "W")
ENVOY 98 (4.3L, VIN W, 6-262)
GMC 1500 PICKUP 96-98 6-262 (4.3L, VIN "W")
GMC VAN 96 Savana, 6-262 (4.3L, VIN "W")
GMC VAN 97-98 4.3L (VIN W, 6-262)
GMC VAN 99 4.3L (VIN W, 6-262), ID ABA & ABC (standard bell housing bolts)
ISUZU HOMBRE 97-98 4.3L (6 cyl), VIN "W" (8th digit)
S10/S15/SONOMA 96-98 6-262 (4.3L), VIN "W"
SAFARI (GMC) 96-98 (4.3L, VIN W, 6-262)
B -----------
ISUZU HOMBRE 97-98 4.3L (6 cyl), VIN "X" (8th digit)
S10/S15/SONOMA 96-98 6-262 (4.3L), VIN "X"
C -----------
ASTRO 99 (4.3L, VIN W, 6-262)
BLAZER S10/JIMMY S15 99 (4.3L, VIN W, 6-262)
BRAVADA 99 (4.3L, VIN W, 6-262)
CHEVROLET VAN 99 4.3L (VIN W, 6-262), ID UBA & UBC (metric bell housing bolts)
CHEVROLET VAN 00-02 4.3L (VIN W, 6-262)
ENVOY 99 (4.3L, VIN W, 6-262)
GMC VAN 99 4.3L (VIN W, 6-262), ID UBA & UBC (metric bell housing bolts)
GMC VAN 00-02 4.3L (VIN W, 6-262)
ISUZU HOMBRE 99 4.3L (6 cyl), VIN "W" (8th digit)
S10/S15/SONOMA 99 4.3L (6-262), VIN W
SAFARI (GMC) 99 (4.3L, VIN W, 6-262)
SIERRA 1500 PICKUP 99 4.3L (VIN W, 6-262)
SILVERADO 1500 PICKUP 99 4.3L (VIN W, 6-262)
D -----------
ISUZU HOMBRE 99 4.3L (6 cyl), VIN "X" (8th digit)
S10/S15/SONOMA 99 4.3L (6-262), VIN X
================================================================
NOTES
================================================================
Chevrolet 4.3L (6-262).
Change induction, exhaust & electrical systems as necessary.
|A| thru |D| interchange as shown in notes.
C -----------
Ident: ABA '01
Ident: ABB '01
Ident: ABC '01
Ident: TBF '00
Ident: TBH '00
Ident: TBJ '00
Ident: UBA '02
Ident: UBB '02
Ident: UBC '02
VIN "W", option L35.
Conventional distributor.
S.F.I.
Balance shaft.
Crankshaft position sensor.
Bell housing to block bolts are metric.
Crankshaft is shorter, resulting in a thicker flywheel to accommodate.
Switch oil pans as necessary for 4x2 & 4x4.
|A| fits by including bell housing bolts and flywheel.
|B| fits by including bell housing bolts and flywheel, but has lower perf. camshaft.
|D| fits; but has lower perf. camshaft.
=================================================================
I don't see anything that would indicate a pilot-hole difference.
Perhaps your customers' vehicle is incorrect and/or the trans isn't original and modifications have already been made.
I wish I could offer you more insight. Have him send you photos of the differences. Most times a photo can clear things up pretty quickly.
Thanks for the question, I hope this information was helpful to you.
Fred
www.knucklebusters.us
570-453-0910
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