When the modulator in a 3N71A or L4N71B unit fails, shift quality suffers immediately, and replacing it with the correct screw-in unit is a straightforward fix that restores proper vacuum-driven shift scheduling. This listing is a single screw-in modulator with a .84 diaphragm, compatible with both turbo and non-turbo versions of the 3N71A and L4N71B automatic transmission, covering applications from 1971 onward.
The modulator controls shift points by reading engine vacuum and signaling the valve body accordingly. A cracked or degraded diaphragm causes delayed, early, or inconsistent shifts. Replacing the modulator as a standalone part, rather than pulling a full kit, makes sense when the rest of the unit is in serviceable condition and this component alone is the source of the problem.
This is a single piece, not a kit. It does not include seals, gaskets, clutch discs, steels, or any other components. If your service requires additional parts, those must be sourced separately. The screw-in thread design allows direct installation into the case without adapters on units that accept this modulator style.
Since 1991, REMCO has worked exclusively in automatic transmission parts. Each order is packed individually and checked against its item record before it ships. The shipping weight for this modulator is 1 lb.
Before ordering, confirm the code stamped on your transmission matches 3N71A or L4N71B, verify whether the application is turbo or non-turbo, and confirm that your unit uses a screw-in modulator with a .84 diaphragm. Getting those three points right before placing the order eliminates the most common reasons for a return on this part.
- Restores vacuum-controlled shift behavior in 3N71A and L4N71B automatic transmission units, addressing erratic or incorrect shift points caused by a failed modulator.
- This listing covers one modulator only. It does not include any seals, gaskets, filter, clutch discs, steels, or band. Review what your service requires before ordering to avoid a mismatch.
- Screw-in design with .84 diaphragm fits both turbo and non-turbo variants of this unit, making it usable across a wider range of applications within the 3N71A and L4N71B family.
- Single piece: one screw-in modulator, .84 diaphragm. Shipping weight 1 lb. Confirm part number against the unit tag before placing your order to avoid a return.
- Before ordering, verify the transmission code stamped on the unit and confirm whether the application is turbo or non-turbo. The diaphragm size is .84; confirm this matches your specification.
| modulators l3n71b l4n71b screw-in (.84 diaphragm) turbo & non-turbo 1971-up Automatic transmission |
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