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5.7 Vortec in a 98 Silverado Z-71

Is this ok with the original 5.3 tranny?

5.7 Vortec in a 98 Silverado Z-71

Postby SilveradoKid [OP] » Aug 15 2011, 5:54am

I am buying a 98 Silverado Z-71 4x4 with 160K on the body & tranny, I think the original engine was the 5.3, or possibly the 4.8 - In either case, should I worry about the transmission handling the 350 ft/lb or torque versus the 305-335 ft/lb of it's original engine? Your input is appreciated, thanks!
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Re: 5.7 Vortec in a 98 Silverado Z-71

Postby Z15 » Aug 15 2011, 1:21pm

5.3L engine came out with the 99 new body style trucks, it was not used in a 1998 truck.

The engines for 98 were
5.7 V8
5.0 V8
4.3 V6
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Re: 5.7 Vortec in a 98 Silverado Z-71

Postby SilveradoKid [OP] » Aug 15 2011, 2:01pm

Ok, so lets say it was either of the smaller options... probably the 5.0, is the extra torque from the 5.7 going to be a problem on the tranny, or did they use the same tranny on both to begin with?
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Re: 5.7 Vortec in a 98 Silverado Z-71

Postby 98 gmc 4x4 » Aug 15 2011, 2:08pm

hello the 5.7L had 4 o2 sensors and the 5.0L had 3 o2 sensors on the exhaust. This also was my debate on when i put a engine on my truck if the 5.7 would work but i think you would have to change the 02 senzors for the computers to make the truck run right
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Re: 5.7 Vortec in a 98 Silverado Z-71

Postby Z15 » Aug 15 2011, 2:34pm

SilveradoKid wrote:Ok, so lets say it was either of the smaller options... probably the 5.0, is the extra torque from the 5.7 going to be a problem on the tranny, or did they use the same tranny on both to begin with?


Same trans for both V8's.

There is a RPO Label in the glove box with the original engine and trans codes, look for anything beginning with an L for the engine codes, L05 for instance. Trans code begin with M, axle codes begin with a G.
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Re: 5.7 Vortec in a 98 Silverado Z-71

Postby SilveradoKid [OP] » Aug 15 2011, 2:57pm

Thank you for the answer to my question Z15! The new engine is already in the truck and working very well, just wanted to make sure it wasn't a long term strain on the tranny, thanks y'all!
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Re: 5.7 Vortec in a 98 Silverado Z-71

Postby Chasmanian » Aug 15 2011, 6:33pm

Why do you think it's not the original engine? Or the same size engine that was in before?
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Re: 5.7 Vortec in a 98 Silverado Z-71

Postby SilveradoKid [OP] » Aug 15 2011, 11:48pm

It might be the original engine size, but the guy I'm getting it from put a new engine in it built by a local engine/machine shop. I just assumed he went the biggest he could and I also thought the 1500 only went up to the 5.3 so I guess i'm way off but either way I think it's gonna be a great truck! If all goes to plan I'll be picking it up on Saturday.
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Re: 5.7 Vortec in a 98 Silverado Z-71

Postby SilveradoKid [OP] » Aug 18 2011, 4:02am

So yeah it is originally the 5.7 and was rebuilt bottom to top with all brand new parts, crank, bearings, heads, pistons, etc. and was bored out so it's a little bigger now. So why isn't there a sub-forum here for the 5700 engine?
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