The throttle valve, also known as the vacuum modulator, gets its signal from intake manifold vacuum, which is controlled by engine load and throttle position. Band adjustment is similar, with a setscrew and locknut like C4 and C6. We're going to address how you can improve your C4's performance by showing you what the pros recommend for performance or just plain cruising. If this were the case then the root cause of the problem is a loose connection between the steering wheel and driver's seat. Four bellhousing patterns: six-bolt small-block, rounded six-bolt for FE big-block, six-bolt for 385/M-series engines, and six-bolt for diesel with bottom dust cover. The '64-'66 C4 transmission has the dual-range valvebody, which is not what you want for your performance build. Another easily noticeable symptom of a bad vacuum modulator is having the check engine light illuminate on your dashboard. On the right is our standard. C4 transmission vacuum line diagram 2004 ford f 150. 2) Check Engine Warning Light. Ravineaux planetary gearset (a single, twin planetary unit), which was continued in the Automatic Overdrive (AOD) introduced in '80. A little less is even better. VACUUM DIAGRAMS 944 TURBOOne of the most common problems we find with the 944 Turbo is vacuum line related, whether it's old and leaking hoses, or mistakes in the plumbing of your updated vacuum lines. The main symptom you will notice is weak engine performance. Processing and shipping time for this product may take longer than normal.
Placing the shifter on the small dot kept the transmission in second gear, for slow, slippery road driving. Most of the customer cars we have a chance to view have things incorrect. Hello, can someone give me a hand please. C4 transmission vacuum line diagram chevy s 10. However, it may surprise you to know that most automatic transmissions work via a very simple principle known as hydromechanics—planetary gear sets, multi-disc clutch packs, bands and drums, and a hydraulic control system. Nice discussion is going on, it is really helpful. Resurface the shaft or replace if scoring is found. In its most basic form, the C4 has room for additional clutches.
Allow the engine to idle for a minute prior to placing the selector in gear. E) Slip the standard vacuum hose into the stretched 1/4" hose. C4 transmission lines diagram. Many of you zip tie everything anyway. Hint-the larger the better. Check all contact surfaces for scratches and nicks, which will cause leaks. Any luck with trouble shooting the shift point? Type F was originally specified due to its friction enhancers and seal compatibility, but this rule doesn't apply with rebuilt transmissions with new seals and frictions.
Mike's Transmissions in Lancaster, California, has a dust shield designed to fit both the 157-tooth and 164-tooth bellhousings. Turn the modulator adjustment screw in a clockwise direction with the screwdriver to firm up and delay the up-shift of the transmission. Friction material tends to cut the seals, which allows hydraulic pressure to escape, causing clutches and bands to slip even more. If you don't see what you're looking for, feel free to get in touch with us and we'll see what we can find. Eight-bolt valve body and main case, '70-'82. I would think that would result in a very rough running engine, noticeably bad, like if you pull a cap off an unused manifold vacuum port, no? 4 Bad Transmission Vacuum Modulator Symptoms (and Replacement Cost. Could be the vacuum modulator, or vacuum line, or low on fluid. As these changes occur, the modulator adjusts the shift timing of the transmission according to the demand of the engine. If the vacuum leak is too severe, then you will notice less power in your engine as well as acceleration problems. I attached a pic of the lines. When going wide open throttle out of the hole, the car normally will shift into 2nd gear around 4800-5000 rpms at 55ish mph.
Because stock torque converters won't hold up in performance applications. For example, when you drive your car downhill, there is a smaller load on the engine because gravity is helping the vehicle move. Could be a worn out tranny, like this: I doubt anything has changed in the internals of the transmission like the governor or valve body that would change the shift points. The vacuum modulator has a vacuum line which is attached to the intake valve and calculates the engine's vacuum amount. Once it detects this amount, it can allow the transmission to shift appropriately. C4 Tranny concerns - Classic Cougar Maintenance Restoration and Repair. So after we remove it we put new one and do we do any adjustments. The FluidYou don't have to use Type F fluid in your vintage Ford automatic transmission anymore unless it is already serviced with Type F. If you're pressing a freshly rebuilt C4, C6, or FMX transmission into service, you are free to use Dexron III or Mercon IV fluid. On the other hand, when you're driving up a hill with lots of people in your car, the load on the engine is going to be much greater. That's also the easiest place to look when starting to troubleshoot since it is all pretty accessible and easy to trace out. Just choose your application for a custom fit!
In the '80s, Ford gave the C4 a locking torque converter for greater efficiency and renamed it the C5. Outside of the intermediate band issues just mentioned, the C6 was engineered for durability from the get-go. Just follow your Ford Shop Manual instructions. Cast-iron main case and tailshaft housing with aluminum bellhousing. The C8DP part number tells us it is a '68 casting. Shop VACUUM DIAGRAMS. How to Adjust the Transmission Modulator Valve on a Ford C4. NOTE: It can also require engine re-tuning with the hoses now in the correct configuration since the car was tuned with the wrong configuration, in particular, if you have adjustable fuel regulators, MAF systems with controllers or EMS controlled cars. Lower the vehicle to the ground and remove the jack and the wheel chocks. The torque converter immediately transfers the engine's peak torque to the wheels. Borg-Warner designed and manufactured from '68-79 for 351W and 351C engines. A B&M Shift Improvement Kit isn't just about racing or blasting from traffic light to traffic light. The 289 high performance V-8 C4 was fitted with the popular "C" servo, which was the largest size available.
In 1967, Ford phased out the Dual-Range C4 Cruise-O-Matic, going to a more conventional valvebody and shifter with a P-R-N-D-2-1 shifter pattern that was easy to use. Thanks alot for your suggestions. We want aggressive upshifts during wide-open throttle, yet smooth and unnoticed during deceleration to a stop. May not have to even take it out. Ford C4 Automatic Transmission - C4 Performance Upgrades - Mod Tech. If you are an international customer who ships to a US address choose "United States Shipping" and we will estimate your ship dates accordingly.
A stock torque converter's stall speed is typically around 1, 500 rpm. When Ford introduced the C6 in '66, these old ironsides were dropped in favor of the newer, lighter C4 and C6 transmissions. Using state-of-the-art tubing benders, the lines are pre-bent like the original factory lines to simplify installation. F) Now you have a double wall hose assembly! If your vacuum modulator were to become defective, there are certain signs you could recognize right away to help determine this. And I finally found out what the issue shift at all. Sure glad you dropped in to help us with this one. I guess they would be different in 1882 eh? Raise the vehicle and remove the jack stand. B&M Racing & Performance has a variety of transmission coolers sized to work in your application. All you have to do is cut the dust shield for your 164-tooth application. Or are, going in the right direction. Examine shaft surfaces for scoring during a rebuild.
Install A Shift Improvement Kit. When we asked them what the greatest reason for transmission failure was, they have all said the same thing-heat. Diesel V-8: Same as 429/460 except opening at bottom for torque converter access. Having a bad vacuum modulator will obviously affect normal shifting.
Raise the vehicle on the passenger side using a jack. Lip springs often pop out unnoticed, which will cause leakage. Take a close look where the starter fits, and you will see the perforation for your cut. "R" intermediate servo is the largest and most desirable. Updated on July 28, 2022). For '70, Ford changed the C4's main case and valve body to an eight-bolt pattern. It is about longer transmission life. Think about it, if the moon can move an entire ocean, just imagine what it could do to a car! They can be adjusted ya know.
It just isn't as large as the "C" servo, but it is plentiful and cheap. Hey guys… a new issue has just arose with my 69 Xr7. Shown here are two C4 intermediate servos. 390/428 FE: Round seven-bolt bellhousing with three-bolt starter boss; smooth or finned back.