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Hi all,
I have an '89 745T with a '90 5.0 HO and AOD.
Both car and engine have apx 300k on 'em.
The engine is stock, w/ dual exhaust from an '03 SVT Cobra ( four little cats ). I failed emissions for the first time since the conversion in 2005 and I figured this would be a good time for a comprehensive tune up.
She's a backup/daily driver I sometimes use for business travel. No drivability issues at present, it's just that most of the tune up items under the hood all have about 60k miles on them...I'd like to get better than stock parts where possible w/o going overboard.I have a couple of questions for you:
1. Have I left anything out of this list ?
Wires/plugs/rotor
EGR valve (it's original)
Fuel/air filters ( fuel pump replaced recently)
Fluids/filters including rear end and AOD
2. Considering the mileage, I was thinking of replacing the coil/distributor,ect.,along with the plugs/wires. What type do you recommend ? I'm currently considering MSD components. Any other advice on any best parts to use and timing/ tuning issues would be appreciated.
3. I believe the injectors are the originals. I've always used 91-93 octane, and I run Techron through them every so often. Can I have them cleaned/rebuilt or would it be best to replace them ?
4. Depending on the numbers, I'm tempted to get some shorty headers. Is there a specific type/brand that works best with a 5.0 in a 740 ?
5. Bonus question: The AOD works fine, but there's always been a "clunk" sound that can be felt when it shifts into OD. My wife brought it up- I'd learned to live with it since you can eliminate it with just the right amount of throttle. I was told by a transmission shop that " they all do that" which is obviously not true, since I've driven more than several that don't do this. I asume the issue is with the trans- it's done this with the stock 2 piece driveshaft, and also with the present one piece unit.Other than the OD clunk, it shifts fine. What do you think ? I'm not against getting another trans in the future, funds permitting. Is it possible ( or even desirable ) to adapt a GM 700/R4 to the 5.0 ?
Please add any other points that I may not have thought of. I'd like to keep this one running well for as long as possible...And someday add a 940 wagon with 5 speed LS power :)
THANKS,
Bill
89 740 5.0
Bilstien HD's
Hydras
Stock springs
Upper/lower strut braces
IPD swaybars front/rear
Single piece driveshaft
Four little puller fans mounted to TD radiator
H4's/H3's/Hella fogs below the bumper
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